HOUSTON – A man was shot and killed Wednesday while walking with his son to a southwest Houston convenience store, police said.

The shooting was reported about 1:10 a.m. near Clarke Springs Drive and Reddy Lane.

Houston police Sgt. Thomas Simmons said neighbors reported hearing four gunshots before the man was found dead in the front yard of a home.

Family members identified the man as 46-year-old Michael Lawson.

Lawson's wife said her husband liked to wake up early and take a walk to get in some exercise.

Simmons said investigators believe a small brown car, possibly a Toyota Camry, was seen speeding away from the area after the shooting.

Investigators are still trying to determine a motive, Simmons said.

The son, 17, was not injured.

"I don't know why somebody would take his life like that. I don't know," Jamyle Jackson said.

Jackson said he and his family members are hurting in a way they could have never imagined. Jackson said his dad was hardworking and a good provider.

"Handyman, construction. He would pick up jobs, trying to do the best he can to take care of our family," Jackson said.

As the investigation into who is responsible, how many were involved and the why in all of this continues, Jackson is urging anyone who might know anything not to waste time and speak up immediately.

"Tips. Whatever. Call our family. Whatever you all have to do. Let us know," Jackson said.

The family has set up a GoFundMe account to help raise money for Lawson's funeral. Click here if you would like to donate.