The only episode that comes close to that description is Season 9's And Then There Were Fewer
Season 8, ep. 11, "Dial Meg for Murder"
Season 5
its on season 4
Season 4|Episode 27 "Griffin Family History"
"Patriot Games" Season 4: Episode 20
Dial Meg for murder, season 8
Season 8, ep. 11, "Dial Meg for Murder"
Season 4
Season 6, Episode 8. (it's the eighth episode in the season)
Recipe For Murder
Recipe for Murder
The episode profiling David Duyst on Forensic Files aired in 2004 as part of the show's second season. It is titled "Pure Evil" and explores Duyst's criminal activities and capture.
Season 7|Episode 8 Family Gay
Season Three|Episode Two Brian Does Hollywood
It is season 5 episode 5
If you're American, it's season seven; if you're British it's season eight. The episode's called 'Family Gay'
Recipe for Murder.