Jay Mohr leaves the cast and Jamie Kennedy joins it during the fourth season of The Ghost Whisperer.

Fans can relive these changes, or watch them for the first time, when the Jennifer Love Hewitt drama comes out on DVD on September 22.

Not many details about it are known, but expect commentaries and a behind-the-scenes look at the making of various episodes to be included in the box set.

Here's the cover are for it:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.