Steve Mostyn, a prominent Houston trial attorney and a top Democratic Party donor, has died. He was 46.

In a statement, his family confirmed Thursday his death on Wednesday "after a sudden onset and battle with a mental health issue."

"Steve was a beloved husband and devoted father who adored his children and never missed any of their sporting events," the statement reads. "He was a true friend, and a faithful fighter for those who did not have a voice."

"Steve touched countless lives. Many friends and colleagues in Texas and throughout the country have reached out during this painful time. Our family is requesting privacy . . . The details of a celebration of Steve's life will be announced at a later date."

"In honor of Steve's life and legacy,  please consider supporting the important work of the Mostyn Moreno Foundation or the Special Olympics of Texas. If you or a loved one are thinking about suicide, or experiencing a health crisis, call the National Suicide Prevention Lifeline right now."

Born John Steven Mostyn  in Whitehouse, a small town in East Texas, just southeast of Tyler, Mostyn graduated from the South Texas College of Law in 1996 and joined a Houston firm. Soon, he went on his own to create what he called "a uniquely different Texas law firm" -- Mostyn Law -- that focused on corporate negligence and wrongdoing.