Index: psutil/__init__.py
--- psutil/__init__.py.orig
+++ psutil/__init__.py
@@ -14,6 +14,7 @@ sensors) in Python. Supported platforms:
  - FreeBSD
  - OpenBSD
  - NetBSD
+ - SecBSD
  - Sun Solaris
  - AIX
 
@@ -66,6 +67,7 @@ from ._common import OSX  # deprecated alias
 from ._common import POSIX  # NOQA
 from ._common import POWER_TIME_UNKNOWN
 from ._common import POWER_TIME_UNLIMITED
+from ._common import SECBSD  # NOQA
 from ._common import STATUS_DEAD
 from ._common import STATUS_DISK_SLEEP
 from ._common import STATUS_IDLE
@@ -171,7 +173,7 @@ __all__ = [
     "POWER_TIME_UNKNOWN", "POWER_TIME_UNLIMITED",
 
     "BSD", "FREEBSD", "LINUX", "NETBSD", "OPENBSD", "MACOS", "OSX", "POSIX",
-    "SUNOS", "WINDOWS", "AIX",
+    "SECBSD", "SUNOS", "WINDOWS", "AIX",
 
     # "RLIM_INFINITY", "RLIMIT_AS", "RLIMIT_CORE", "RLIMIT_CPU", "RLIMIT_DATA",
     # "RLIMIT_FSIZE", "RLIMIT_LOCKS", "RLIMIT_MEMLOCK", "RLIMIT_NOFILE",
@@ -410,8 +412,8 @@ class Process(object):  # noqa: UP004
         # on PID and creation time.
         if not isinstance(other, Process):
             return NotImplemented
-        if OPENBSD or NETBSD:  # pragma: no cover
-            # Zombie processes on Open/NetBSD have a creation time of
+        if OPENBSD or SECBSD or NETBSD:  # pragma: no cover
+            # Zombie processes on Open/Sec/NetBSD have a creation time of
             # 0.0. This covers the case when a process started normally
             # (so it has a ctime), then it turned into a zombie. It's
             # important to do this because is_running() depends on
@@ -1235,7 +1237,7 @@ class Process(object):  # noqa: UP004
             try:
                 os.kill(self.pid, sig)
             except ProcessLookupError:
-                if OPENBSD and pid_exists(self.pid):
+                if OPENBSD or SECBSD and pid_exists(self.pid):
                     # We do this because os.kill() lies in case of
                     # zombie processes.
                     raise ZombieProcess(self.pid, self._name, self._ppid)