Edwin Jarvis was Tony Stark's personal and pessimistic butler. When Tony dated and eventually became engaged to his teammate, Natasha Romanova (the Black Widow), Jarvis was at continuing odds with her. Jarvis was later shot in the head by Natasha when she revealed herself to Stark as the traitor within the Ultimates team.
Jarvis' death contributed Tony Stark's descent into full-blown alcoholism.