He was an uninteresting character so he was written out of the show and (to apparently to stop the questions of his whereabouts), in the episode of "Stew-Roids", Joe revealed Kevin died in Iraq.
However, he returned in the Season 10 episode, titled "Thanksgiving", and it was revealed he was indeed alive and had gone AWOL from the military having faked his death.
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Well he didn't die in the episode but it was revealed he had died in Iraq in the episode Stew-roids
However it was revealed in the Season 10 episode Thanksgiving that Kevin faked his death and moved back to Quahog.
Joe Swanson from the Family Guy is voiced by Patrick Warburton. Joe is a police officer in the series.
Cleveland Brown
Stewie Griffin. There's also Susie Swanson.
There are several moms on Family Guy. Lois Griffin, Bonnie Swanson, Loretta Brown, Barbara Pewterschmidt, Carol Pewterschmidt, Thelma Griffin & many minor characters.
Nothing happened to her. There hasn't been a need for her in any episodes recently.