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
Season 11, Episode 7 - "Murder, She Wrote"
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.