Ex-NFLer Sergio Brown Parties In Tulum As Investigation Into Mom’s Death Continues

Ex-NFL player Sergio Brown was spotted in Tulum on Sunday … dancing and partying his face off — this despite an ongoing police investigation into the death of his mother.

Brown — wearing red Nike swim trunks — didn’t seem to have a care in the world as he swayed shirtless with patrons on the dance floor at a popular club in the Mexican city.

One witness tells TMZ Sports … the former Indianapolis Colts defensive back was at the venue for several hours — chatting it up with people and buying alcohol for others, before bolting.

The scene is eyebrow-raising, to say the least … considering cops in Maywood, Ill. have been searching for Brown after his mom, 73-year-old Myrtle Brown, was found dead near a creek on Sept. 16. Both she and Sergio were reported missing just hours prior.

Officials later ruled Myrtle’s death a homicide … saying she sustained injuries in an assault. Cops have not released information regarding potential suspects.

There had been speculation that the 35-year-old had left Illinois and traveled to Mexico … after an Instagram account apparently belonging to the ex-football player posted a video of him in the country rambling about “fake news.”

It’s unclear where the investigation into Myrtle’s death now stands … we reached out to the Maywood Police Dept. multiple times on Monday but have yet to hear back.