The Austin Police Department has closed the book on Brianna Aguilera‘s death, ruling it a suicide … but the family still doesn’t believe law enforcement.

Tony Buzbee, the attorney for Aguilera’s family, tells TMZ they still think Brianna’s death was more nefarious … adding, “The Austin Police screwed things up royally.”

Buzbee says there’s no credible evidence to back APD’s suicide claim, full stop.

ICYMI … Aguilera was found dead outside an apartment building on Saturday, hours after attending Texas A&M’s football game against the University of Texas with trauma from an apparent fall from a high floor.

Brianna lost her phone earlier in the day, cops say … and, she borrowed a friend’s to call her boyfriend around 12:43 AM. The call lasted only about a minute — and, then cops say Aguilera lept to her death from the 17th floor of an apartment building.

Police immediately started investigating … and, after locating her phone, officers say they discovered a typed-out suicide note written several days before Aguilera passed away.

Stephanie Rodriguez — Brianna’s mother — called BS on the suicide ruling in the immediate aftermath … claiming her daughter was excited about her career in law, and insisting she wasn’t suicidal.

However, Detective Robert Marshall of APD said in a press conference, “Brianna had made suicidal comments previously to friends, back in October of this year. This continued through the evening of her death, with some self-harming actions early in the evening and a text message to another friend indicating the thought of suicide.”

Savannah Chrisley is back in the Cayman Islands with a mystery man … and this time she’s on dry land, wining and dining at a waterfront restaurant.

TMZ obtained a new photo showing the reality star at Casanova Restaurant in George Town … and she’s seated for dinner across from a mystery man, enjoying some live music before their food comes.

Folks who were there tell us Savannah and her mystery man sat down around 6:30 PM Thursday night, getting a table in the corner.

We’re told waiters appeared to welcome the pair back, as if they’d been there several times before, and quickly brought them a bottle of Champagne.

Unclear who the mystery man is here, but we’re told Savannah held his hand, talked closely to him and they both seemed to be very smitten … in other words, this was clearly a date night.

Savannah’s no stranger to hanging out with hot dudes in the Cayman Islands … we saw her down there back in August, when she was canoodling with a man in the Caribbean waters.

The Centers for Disease Control is a total “clown show,” and people need to trust the advice of their local doctors instead … so says a respected pediatrician.

Dr. Paul Offit joined us on “TMZ Live” Friday to talk after the Centers for Disease Control vaccine advisory committee voted to remove the recommendation that all newborns get the hepatitis B vaccine.

Offit says he is outraged by the CDC’s vote … claiming more infants and toddlers will suffer from the disease because of the new, uninformed recommendation.

He calls it difficult to watch “this clown show, this parody of a public health agency act the way that they do.” He adds he and his colleagues are standing back, horrified at the changes being made.

Offit says there’s still hope that people will take the vaccine even if the CDC’s no longer recommending it universally … telling us he thinks people will listen to their trusted doctors whom they talk to all the time — not Robert F. Kennedy Jr. or other health officials they’ve never met.

Worth noting … Republican Senator Bill Cassidy — who worked as a liver specialist in Louisiana for many years — has already bashed the change. He’s urging acting CDC Director Jim O’Neill not to sign it.