They have questioned her ex-boyfriend, former LSU offensive lineman La'el Collins, but he is not considered a suspect

Police have not yet named any suspects in the murder of his mother, Brittney Mills, 29, who was eight months pregnant when she was shot

Brenton Mills was delivered after his mother was shot in Louisiana on April 24 but passed away on Friday due to lack of

A baby boy who was delivered when his heavily-pregnant mother was gunned down on her doorstep has passed away a week on.

Brenton Mills was born on April 24 after 29-year-old Brittney Mills was shot at her Baton Rouge, Louisiana home but he died on Friday due to lack of oxygen to the brain - a result of his mother's blood loss, Nola.com reported.

Police announced the boy's death, which has been ruled a homicide, on Monday.

No one has yet been named a suspect in the murder of Mills, who was eight months pregnant when she was shot multiple times in the upper body.

Killed: Brittney Mills, pictured left with her 10-year-old daughter and right,, was shot dead at her Louisiana home last month and her son was delivered after she was rushed to hospital. The boy has also now died

Investigators believe that Mills knew her killer and that she was shot for refusing to let the gunman take her car. After shots were fired, the assailant then fled the scene.

Neighbors reported hearing two shots at around 10.30pm and said that the door to the apartment was ajar when officers arrived, the Advocate reported.

Mills, who also has a 10-year-old daughter, was rushed to hospital but could not be saved.

Following her death, former Louisiana State University offensive lineman, La'el Collins, was questioned by police because they had been romantically linked.

But police have said the 21-year-old is not considered a suspect.

It is not known who fathered the little boy and it is unknown whether Collins will undergo a paternity test.

Questions: La'el Collins, a former LSU offensive lineman, was interviewed by police over the murder because he was previously romantically linked to Mills, but he is not being considered a suspect

Scene: Police have not named any suspects in the case but said they believe Mills opened her door to the gunman at her apartment complex (pictured). She was shot multiple times in the upper body

His attorney told ESPN last week that he has been in constant contact with the lead detective on the case as Collins headed to Chicago ahead of the weekend's NFL draft.

'We took the investigation seriously,' said Jim Boren. 'We've tried to rule him out as a suspect. We're going to provide that information to the police, and ultimately [Collins] will sit down and talk to them. But the timing is poor.'

Collins, who was a predicted first-round pick, went undrafted over the weekend in the NFL Draft.