UNIVERSITY PARK — More than 300 people filled McFarlin Auditorium on the campus of Southern Methodist University on Thursday to celebrate the life of Officer Mark McCullers.

McCullers, 45, was swept away during a flash flood in the early morning hours of July 5 as he worked off-duty at home under renovation near Turtle Creek.

The former Marine, husband, and father to six children in a blended family, joined SMU Police Department in early 2015.

Hundreds attended a memorial service for SMU police officer Mark McCullers on Thursday July 28, 2016 in Dallas.  McCullers, 45, was swept away during a flash flood on Turtle Creek on July 5.
Hundreds attended a memorial service for SMU police officer Mark McCullers on Thursday July 28, 2016 in Dallas.  McCullers, 45, was swept away during a flash flood on Turtle Creek on July 5.

SMU Police Chief Richard Shafer said on Thursday that McCullers was instrumental in creating the security procedures at the George W. Bush Presidential Library and Museum prior to its opening in April 2013.

"Then, he told me he wanted to become an SMU police officer," Shafer said. "He had plenty of experience from being a military police officer, but still happily went through the police academy the State of Texas requires."

Tiffany McCullers told the crowd of friends, family, and law enforcement from around North Texas she wanted to share a message she knows her husband would want heard.

"Those that love Mark and want to honor and remember him –- you need to leave here today and make your mark on this world,” McCullers said.

Highland Park Fire Department trucks hold up an American flag during the memorial service for missing SMU officer Mark McCullers on Thursday July 28, 2016.
Highland Park Fire Department trucks hold up an American flag during the memorial service for missing SMU officer Mark McCullers on Thursday July 28, 2016.