After an autopsy and toxicology tests, it's been determined that Loncar died of the "toxic effects of cocaine" and the underlying health issues of high blood pressure and heart disease.
The Medical Examiner officially ruled the 56-year-old's death accidental.
Loncar was found unresponsive in a car outside his office, in the 400 block of South Cesar Chavez in Dallas, on December 4.
After the findings were released the Loncar family released a statement that said, in part -
"While we accept this scientific finding, those of us who were closest to him already knew the cause of his death. Brian died of a broken heart.
Brian's passing followed his daughter Grace's death by suicide. These are unimaginable losses for our family.
Hopefully, these events will serve as heartbreaking reminders that we all need to reach out and care for our loved ones - every day."
With 11 offices across Texas, Loncar wasn't just an attorney; he was the founder of a business that employed dozens.
Colleagues at Loncar's law firm have said they will continue the work with the team he built.
Loncar is survived by his wife and five of his children.
(©2017 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)
for more features.