Though the article below doesn't make it clear, this one does clarify that UNNAMED DAD was in fact custodial, that the baby lived with dad and the grandparents. Not one of the articles I have seen on this apparent murder-suicide explain what happened to the mom, how an emotionally unstable father got custody, or who gave him custody.
http://www.wect.com/story/31892036/police-child-found-dead-father-dead-in-apparent-suicide
Police: Child found dead, father dead in apparent suicide
Published: Wednesday, May 4th 2016, 4:28 pm
EDT
D'IBERVILLE, MS (WLOX) -
An investigation is underway in D’Iberville involving a dead 10-month-old and a father who apparently hung himself from an apartment stairwell.
Police Chief Wayne Payne said police and medical crews were called to the Landmark Apartments on Lamey Bridge Rd. around 4:10 a.m. Wednesday. Payne said first responders found the child dead on the floor of an apartment.
According to police, the child’s grandfather woke up his son around 4 a.m. to tell him the 10-month-old was unresponsive. Payne said the grandfather found the child on the floor and called 911.
According to the grandfather, his son hysterically ran out of the apartment while they were waiting for police to arrive.
Payne said police searched for the father and found him hanging from the stairwell of an adjacent apartment building a short time later.
The man was rushed to the hospital by ambulance, where he was later pronounced dead.
“Anytime an infant child like that dies, it's tragic. It is a tragic event and we hate to see things like this, said D’Iberville Police Department Capt. Marty Griffin. "We’re working, looking to find the answers and the reason why.”
Harrison County Coroner Gary Hargrove expects to perform an autopsy Thursday to determine a cause of death. He said right now, this is being treated as a homicide investigation.