diff --git a/frontend/src/components/tickets/TicketDetailPanel.tsx b/frontend/src/components/tickets/TicketDetailPanel.tsx
index c691559e..42125910 100644
--- a/frontend/src/components/tickets/TicketDetailPanel.tsx
+++ b/frontend/src/components/tickets/TicketDetailPanel.tsx
@@ -1,12 +1,173 @@
-// Placeholder — full implementation in Task 16
-import type { PSATicketSearchResult } from '@/types/integrations'
+import { useCallback, useEffect, useState } from 'react'
+import { X } from 'lucide-react'
+import { psaContextApi } from '@/api/psaContext'
+import type { TicketContext } from '@/api/psaContext'
+import { ticketsApi } from '@/api/tickets'
+import { integrationsApi } from '@/api/integrations'
+import { TicketDetailHeader } from './detail/TicketDetailHeader'
+import { TicketResourceManager } from './detail/TicketResourceManager'
+import { TicketNotesFeed } from './detail/TicketNotesFeed'
+import { TicketAddNote } from './detail/TicketAddNote'
+import { TicketConfigs } from './detail/TicketConfigs'
+import { TicketRelated } from './detail/TicketRelated'
+import type { PSATicketSearchResult, PSATicketStatusItem, PsaMemberResponse } from '@/types/integrations'
+import type { PSAResource } from '@/types/tickets'
 
 interface Props {
   ticket: PSATicketSearchResult
   onClose: () => void
   onStatusUpdated?: (ticketId: number, newStatus: string) => void
+  onSelectRelated?: (ticketId: number) => void
 }
 
-export function TicketDetailPanel(_props: Props) {
-  return <div>Loading ticket details…</div>
+function Skeleton() {
+  return (
+    <div className="px-4 py-3 space-y-2 animate-pulse">
+      <div className="h-3 w-3/4 bg-elevated rounded" />
+      <div className="h-3 w-1/2 bg-elevated rounded" />
+    </div>
+  )
+}
+
+export function TicketDetailPanel({ ticket, onClose, onStatusUpdated, onSelectRelated }: Props) {
+  const [context, setContext] = useState<TicketContext | null>(null)
+  const [resources, setResources] = useState<PSAResource[]>([])
+  const [allMembers, setAllMembers] = useState<PsaMemberResponse[]>([])
+  const [statuses, setStatuses] = useState<PSATicketStatusItem[]>([])
+  const [contextLoading, setContextLoading] = useState(true)
+  const [resourcesLoading, setResourcesLoading] = useState(true)
+
+  const ticketIdNum = Number(ticket.id)
+
+  const loadResources = useCallback(() => {
+    ticketsApi.listResources(ticketIdNum)
+      .then(setResources)
+      .catch(() => {})
+  }, [ticketIdNum])
+
+  useEffect(() => {
+    setContextLoading(true)
+    setResourcesLoading(true)
+    setContext(null)
+    setResources([])
+    setStatuses([])
+
+    Promise.all([
+      psaContextApi.getTicketContext(ticketIdNum),
+      ticketsApi.listResources(ticketIdNum),
+      integrationsApi.listMembers(),
+      integrationsApi.getTicketStatuses(String(ticket.id)),
+    ])
+      .then(([ctx, res, members, statusList]) => {
+        setContext(ctx)
+        setResources(res)
+        setAllMembers(members)
+        setStatuses(statusList)
+      })
+      .catch(() => {})
+      .finally(() => {
+        setContextLoading(false)
+        setResourcesLoading(false)
+      })
+  }, [ticket.id, ticketIdNum])
+
+  function handleStatusUpdated(ticketId: number, newStatus: string) {
+    onStatusUpdated?.(ticketId, newStatus)
+  }
+
+  return (
+    <div className="flex flex-col h-full bg-card border-l border-default overflow-hidden">
+      {/* Panel header */}
+      <div className="flex items-center justify-between px-4 py-3 border-b border-default flex-shrink-0">
+        <span className="text-xs font-semibold uppercase tracking-wider text-muted-foreground">
+          Ticket Detail
+        </span>
+        <button
+          onClick={onClose}
+          className="text-muted-foreground hover:text-primary transition-colors"
+          aria-label="Close ticket detail"
+        >
+          <X className="w-4 h-4" />
+        </button>
+      </div>
+
+      {/* Scrollable body */}
+      <div className="flex-1 overflow-y-auto divide-y divide-default">
+        {/* Header with status selector — optimistic, no loading gate */}
+        <TicketDetailHeader
+          ticket={ticket}
+          statuses={statuses}
+          onStatusUpdated={handleStatusUpdated}
+        />
+
+        {/* Resources */}
+        {resourcesLoading ? (
+          <Skeleton />
+        ) : (
+          <TicketResourceManager
+            ticketId={ticketIdNum}
+            resources={resources}
+            allMembers={allMembers}
+            onChanged={loadResources}
+          />
+        )}
+
+        {/* Notes */}
+        <div>
+          <div className="px-4 pt-3 pb-1">
+            <h4 className="text-xs uppercase tracking-wider text-muted-foreground font-semibold">
+              Notes
+            </h4>
+          </div>
+          {contextLoading ? (
+            <Skeleton />
+          ) : (
+            <TicketNotesFeed notes={context?.notes ?? []} />
+          )}
+        </div>
+
+        {/* Add note */}
+        <TicketAddNote
+          ticketId={String(ticket.id)}
+          onPosted={() => {
+            // Re-fetch context to refresh notes
+            psaContextApi.getTicketContext(ticketIdNum)
+              .then(setContext)
+              .catch(() => {})
+          }}
+        />
+
+        {/* Configurations */}
+        <div>
+          <div className="px-4 pt-3 pb-1">
+            <h4 className="text-xs uppercase tracking-wider text-muted-foreground font-semibold">
+              Configurations
+            </h4>
+          </div>
+          {contextLoading ? (
+            <Skeleton />
+          ) : (
+            <TicketConfigs configs={context?.configurations ?? []} />
+          )}
+        </div>
+
+        {/* Related tickets */}
+        <div>
+          <div className="px-4 pt-3 pb-1">
+            <h4 className="text-xs uppercase tracking-wider text-muted-foreground font-semibold">
+              Related Tickets
+            </h4>
+          </div>
+          {contextLoading ? (
+            <Skeleton />
+          ) : (
+            <TicketRelated
+              tickets={context?.related_tickets ?? []}
+              onSelectTicket={ticketId => onSelectRelated?.(ticketId)}
+            />
+          )}
+        </div>
+      </div>
+    </div>
+  )
 }
diff --git a/frontend/src/components/tickets/detail/TicketResourceManager.tsx b/frontend/src/components/tickets/detail/TicketResourceManager.tsx
new file mode 100644
index 00000000..b68bdde7
--- /dev/null
+++ b/frontend/src/components/tickets/detail/TicketResourceManager.tsx
@@ -0,0 +1,121 @@
+import { useState } from 'react'
+import { UserPlus, X, User } from 'lucide-react'
+import { ticketsApi } from '@/api/tickets'
+import { toast } from '@/lib/toast'
+import type { PSAResource } from '@/types/tickets'
+import type { PsaMemberResponse } from '@/types/integrations'
+import { cn } from '@/lib/utils'
+
+interface Props {
+  ticketId: number
+  resources: PSAResource[]
+  allMembers: PsaMemberResponse[]
+  onChanged: () => void
+}
+
+export function TicketResourceManager({ ticketId, resources, allMembers, onChanged }: Props) {
+  const [adding, setAdding] = useState(false)
+  const [selectedMemberId, setSelectedMemberId] = useState<string>('')
+  const [busy, setBusy] = useState<number | null>(null)
+
+  async function handleAdd() {
+    if (!selectedMemberId) return
+    setBusy(Number(selectedMemberId))
+    try {
+      await ticketsApi.addResource(ticketId, Number(selectedMemberId))
+      toast.success('Resource added')
+      setAdding(false)
+      setSelectedMemberId('')
+      onChanged()
+    } catch {
+      toast.error('Failed to add resource')
+    } finally {
+      setBusy(null)
+    }
+  }
+
+  async function handleRemove(memberId: number) {
+    setBusy(memberId)
+    try {
+      await ticketsApi.removeResource(ticketId, memberId)
+      toast.success('Resource removed')
+      onChanged()
+    } catch {
+      toast.error('Failed to remove resource')
+    } finally {
+      setBusy(null)
+    }
+  }
+
+  const assignedIds = new Set(resources.map(r => r.member_id))
+
+  return (
+    <div className="px-4 py-3 space-y-2">
+      <div className="flex items-center justify-between">
+        <h4 className="text-xs uppercase tracking-wider text-muted-foreground font-semibold">
+          Resources
+        </h4>
+        <button
+          onClick={() => setAdding(!adding)}
+          className="flex items-center gap-1 text-xs text-accent hover:text-accent/80 transition-colors"
+        >
+          <UserPlus className="w-3.5 h-3.5" /> Assign
+        </button>
+      </div>
+
+      {adding && (
+        <div className="flex gap-2">
+          <select
+            className="flex-1 bg-input border border-default rounded-[5px] px-2 py-1 text-xs text-primary focus:border-accent focus:outline-none"
+            value={selectedMemberId}
+            onChange={e => setSelectedMemberId(e.target.value)}
+          >
+            <option value="">Select member…</option>
+            {allMembers
+              .filter(m => !assignedIds.has(Number(m.id)))
+              .map(m => (
+                <option key={m.id} value={m.id}>{m.name}</option>
+              ))}
+          </select>
+          <button
+            onClick={handleAdd}
+            disabled={!selectedMemberId || busy !== null}
+            className="px-2 py-1 bg-accent text-white text-xs rounded-[5px] disabled:opacity-40"
+          >
+            Add
+          </button>
+        </div>
+      )}
+
+      {resources.length === 0 ? (
+        <p className="text-xs text-muted-foreground">No resources assigned.</p>
+      ) : (
+        <div className="space-y-1">
+          {resources.map(r => (
+            <div key={r.member_id} className="flex items-center justify-between">
+              <div className="flex items-center gap-1.5 text-xs text-primary">
+                <User className="w-3 h-3 text-muted-foreground" />
+                {r.member_name}
+                {r.is_rf_user && (
+                  <span className="px-1 py-0.5 bg-accent/10 text-accent rounded text-[10px] font-medium">
+                    RF
+                  </span>
+                )}
+              </div>
+              <button
+                onClick={() => handleRemove(r.member_id)}
+                disabled={busy === r.member_id}
+                className={cn(
+                  'text-muted-foreground hover:text-danger transition-colors',
+                  busy === r.member_id && 'opacity-40'
+                )}
+              >
+                <X className="w-3.5 h-3.5" />
+              </button>
+            </div>
+          ))}
+        </div>
+      )}
+    </div>
+  )
+}