Public viewing for George Floyd underway in Houston

Mourners wearing masks lined up in the Houston heat Monday to pay their respects to George Floyd, a black man who died in police custody.

The six-hour public viewing is the last memorial to honor Floyd before his funeral on Tuesday.

Floyd lived in Houston before moving to Minneapolis, where he died on May 25.

Texas Gov. Greg Abbott was among the attendees at the Fountain of Praise church. In a CNN video, he said Floyd "has not died in vain."

"His life will be a living legacy, about the way that America and Texas respond to this tragedy," Abbott said. "I am committed to working with the family of George Floyd to ensure we never have anything like this ever occur in the state of Texas."

Abbott said he was meeting with Floyd's family to express his condolences in private, and that a flag will be flown over the Texas capital in honor of Floyd.

"We are proud George Floyd is a Texan," Abbott said. "This is the most horrific tragedy I ever personally observed. But George Floyd is going to change the arc of the future of the United States."

ABC’s Jim Ryan reports for ABC News Radio:

Kiernan Lane, Alexander Kueng and Tou Thao, who were seen either restraining Floyd or standing as he was being restrained, were all charged with second-degree aiding and abetting felony murder and second-degree aiding and abetting manslaughter. Attorneys for two of the officers said the rookie cops tried to urge Chauvin to stop.

All four officers have been fired.

ABC News' Molly Nagle, Alex Perez and John Verhovek contributed to this report.