diff --git a/CHANGELOG.md b/CHANGELOG.md
index a998666..7a3ef71 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 
 ### Fixed
 
+- Doctor: report lock owner PID and distinguish paired stores locked by another process. (#105 — thanks @artemgetmann)
 - Media: recover panics per download job so one bad payload no longer drains the worker pool. (#179 — thanks @shaun0927)
 - Messages: attribute history messages from LID-addressed groups to the top-level participant sender. (#19 — thanks @entropyy0)
 - Messages: show display text for replies, reactions, and media in `messages context`. (#183 — thanks @fuleinist)
diff --git a/cmd/wacli/doctor.go b/cmd/wacli/doctor.go
index f656724..6a7f7e2 100644
--- a/cmd/wacli/doctor.go
+++ b/cmd/wacli/doctor.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"text/tabwriter"
 
@@ -14,6 +15,31 @@ import (
 	"github.com/steipete/wacli/internal/out"
 )
 
+func parseLockOwnerPID(lockInfo string) int {
+	for _, line := range strings.Split(lockInfo, "\n") {
+		line = strings.TrimSpace(line)
+		if !strings.HasPrefix(line, "pid=") {
+			continue
+		}
+		pid, err := strconv.Atoi(strings.TrimSpace(strings.TrimPrefix(line, "pid=")))
+		if err == nil && pid > 0 {
+			return pid
+		}
+	}
+	return 0
+}
+
+func doctorConnectionState(authed, connected, lockHeld, connect bool) string {
+	switch {
+	case connected:
+		return "connected"
+	case authed && lockHeld && !connect:
+		return "locked_by_other_process"
+	default:
+		return "disconnected"
+	}
+}
+
 func newDoctorCmd(flags *rootFlags) *cobra.Command {
 	var connect bool
 
@@ -57,23 +83,28 @@ func newDoctorCmd(flags *rootFlags) *cobra.Command {
 					connected = true
 				}
 			}
+			lockOwnerPID := parseLockOwnerPID(lockInfo)
 
 			type report struct {
-				StoreDir   string `json:"store_dir"`
-				LockHeld   bool   `json:"lock_held"`
-				LockInfo   string `json:"lock_info,omitempty"`
-				Authed     bool   `json:"authenticated"`
-				Connected  bool   `json:"connected"`
-				FTSEnabled bool   `json:"fts_enabled"`
+				StoreDir        string `json:"store_dir"`
+				LockHeld        bool   `json:"lock_held"`
+				LockInfo        string `json:"lock_info,omitempty"`
+				LockOwnerPID    int    `json:"lock_owner_pid,omitempty"`
+				Authed          bool   `json:"authenticated"`
+				Connected       bool   `json:"connected"`
+				ConnectionState string `json:"connection_state"`
+				FTSEnabled      bool   `json:"fts_enabled"`
 			}
 
 			rep := report{
-				StoreDir:   storeDir,
-				LockHeld:   lockHeld,
-				LockInfo:   lockInfo,
-				Authed:     authed,
-				Connected:  connected,
-				FTSEnabled: a.DB().HasFTS(),
+				StoreDir:        storeDir,
+				LockHeld:        lockHeld,
+				LockInfo:        lockInfo,
+				LockOwnerPID:    lockOwnerPID,
+				Authed:          authed,
+				Connected:       connected,
+				ConnectionState: doctorConnectionState(authed, connected, lockHeld, connect),
+				FTSEnabled:      a.DB().HasFTS(),
 			}
 
 			if flags.asJSON {
@@ -86,8 +117,12 @@ func newDoctorCmd(flags *rootFlags) *cobra.Command {
 			if rep.LockHeld && rep.LockInfo != "" {
 				fmt.Fprintf(w, "LOCK_INFO\t%s\n", rep.LockInfo)
 			}
+			if rep.LockOwnerPID > 0 {
+				fmt.Fprintf(w, "LOCK_OWNER_PID\t%d\n", rep.LockOwnerPID)
+			}
 			fmt.Fprintf(w, "AUTHENTICATED\t%v\n", rep.Authed)
 			fmt.Fprintf(w, "CONNECTED\t%v\n", rep.Connected)
+			fmt.Fprintf(w, "CONNECTION_STATE\t%s\n", rep.ConnectionState)
 			fmt.Fprintf(w, "FTS5\t%v\n", rep.FTSEnabled)
 			_ = w.Flush()
 
diff --git a/cmd/wacli/doctor_test.go b/cmd/wacli/doctor_test.go
new file mode 100644
index 0000000..59c1fe1
--- /dev/null
+++ b/cmd/wacli/doctor_test.go
@@ -0,0 +1,48 @@
+package main
+
+import "testing"
+
+func TestParseLockOwnerPID(t *testing.T) {
+	tests := []struct {
+		name string
+		info string
+		want int
+	}{
+		{name: "pid line", info: "pid=50394\nacquired_at=2026-04-05T12:30:11Z", want: 50394},
+		{name: "trimmed pid", info: " pid= 42 ", want: 42},
+		{name: "missing pid", info: "acquired_at=2026-04-05T12:30:11Z"},
+		{name: "invalid pid", info: "pid=abc"},
+		{name: "zero pid", info: "pid=0"},
+	}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := parseLockOwnerPID(tc.info); got != tc.want {
+				t.Fatalf("parseLockOwnerPID() = %d, want %d", got, tc.want)
+			}
+		})
+	}
+}
+
+func TestDoctorConnectionState(t *testing.T) {
+	tests := []struct {
+		name      string
+		authed    bool
+		connected bool
+		lockHeld  bool
+		connect   bool
+		want      string
+	}{
+		{name: "connected wins", authed: true, connected: true, lockHeld: true, want: "connected"},
+		{name: "locked paired session", authed: true, lockHeld: true, want: "locked_by_other_process"},
+		{name: "connect requested stays disconnected", authed: true, lockHeld: true, connect: true, want: "disconnected"},
+		{name: "plain disconnected", authed: true, want: "disconnected"},
+	}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			got := doctorConnectionState(tc.authed, tc.connected, tc.lockHeld, tc.connect)
+			if got != tc.want {
+				t.Fatalf("doctorConnectionState() = %q, want %q", got, tc.want)
+			}
+		})
+	}
+}