Jovan Belcher -- Daughter's Rep Files Wrongful Death Lawsuit Against Chiefs

Jovan Belcher's infant daughter is following in her grandmother's footsteps ... because her legal rep is suing the Kansas City Chiefs for the wrongful death of the child's late father, TMZ Sports has learned.

Zoey Belcher can't sue the Chiefs herself -- she was only 3 months old when her NFL linebacker dad murdered her mother and shot himself in the Chiefs' facility parking lot back in 2012 -- but her conservator has filed the case on Zoey's behalf, according to court docs.

The suit is nearly identical to the one filed on Tuesday by Zoey's grandmother -- Cheryl Shepherd -- and states the Chiefs were directly responsible for Jovan's failing mental health prior to his death.

The Chiefs allegedly failed to diagnose Jovan's post-concussion syndrome ... which they say caused him to suffer "insane impulses" ... which played a factor when Jovan shot and killed his girlfriend (Zoey's mom) and then himself in December 2012.