diff --git a/lib/libc/sys/procctl.2 b/lib/libc/sys/procctl.2
--- a/lib/libc/sys/procctl.2
+++ b/lib/libc/sys/procctl.2
@@ -320,6 +320,8 @@
 .It Dv REAPER_PIDINFO_REAPER
 The reported process is itself a reaper.
 The descendants of the subordinate reaper are not reported.
+.It Dv REAPER_PIDINFO_ZOMBIE
+The reported process is in the zombie state, ready to be reaped.
 .El
 .It Dv PROC_REAP_KILL
 Request to deliver a signal to some subset of the descendants of the reaper.
diff --git a/sys/kern/kern_procctl.c b/sys/kern/kern_procctl.c
--- a/sys/kern/kern_procctl.c
+++ b/sys/kern/kern_procctl.c
@@ -234,6 +234,8 @@
 			pip->pi_flags |= REAPER_PIDINFO_CHILD;
 		if ((p2->p_treeflag & P_TREE_REAPER) != 0)
 			pip->pi_flags |= REAPER_PIDINFO_REAPER;
+		if (p2->p_state == PRS_ZOMBIE)
+			pip->pi_flags |= REAPER_PIDINFO_ZOMBIE;
 		i++;
 	}
 	sx_sunlock(&proctree_lock);
diff --git a/sys/sys/procctl.h b/sys/sys/procctl.h
--- a/sys/sys/procctl.h
+++ b/sys/sys/procctl.h
@@ -102,6 +102,7 @@
 #define	REAPER_PIDINFO_VALID	0x00000001
 #define	REAPER_PIDINFO_CHILD	0x00000002
 #define	REAPER_PIDINFO_REAPER	0x00000004
+#define	REAPER_PIDINFO_ZOMBIE	0x00000008
 
 struct procctl_reaper_pids {
 	u_int	rp_count;