Tampa police detectives have obtained video from a second surveillance camera Monday night in the investigation into a 4-year-old boy's death.

Based on this new footage, detectives are questioning whether Marterrance Albury actually rolled out of the SUV as the 911 caller first believed or if the boy wandered into the street and was the victim of a hit-and-run.

Detectives are working to obtain a higher resolution version of the video.

Around 9:45 p.m. Sunday, Albury was seen tumbling out of the back passenger door of a Ford Expedition that was heading south on N Florida Avenue near 109th Avenue. A witness who'd been driving behind the Expedition told police he saw Marterrance land on his head before the vehicle's back tires rolled over him.

The Expedition continued south, leaving Marterrance injured in the road. The witness called 911, and Marterrance was taken to St. Joseph's Hospital, where he later died, police said.

At the scene, Marterrance's 17-year-old brother, Sam, approached an officer and said he could not find his little brother. Sam had been put in charge of watching Marterrance by his mother, Johntea L. Williams, 36, while she went out with a friend. The family lives in an apartment on the 10000 block of Brittany Lane, adjacent to where the incident happened.

“In my heart, I feel like somebody grabbed him. Knowing Marterrance, he was probably screaming,” said the boy’s grandmother, Rosemary Williams. “They probably felt guilty and just threw him out.”

Police say Johntea Williams came home at 4 a.m. and became hysterical when learning of his death. She threatened suicide and was taken into protective custody under the Baker Act.

“She’s terrified, hurt beyond hurt. Not a word I can tell you to explain to you, this was her baby,” said Williams.

Investigators don't know who was driving the Expedition and they haven't been able to locate it.

Monday night, police released video taken from a surveillance camera at a nearby car lot. It captured video of the vehicle fleeing southbound on Florida Avenue. Based on the video, detectives are searching for a dark green, possibly black 2000-2004 Ford Expedition.

"I hope whoever did this has a conscience and a heart and to know there’s a thing called karma,” said Williams. “Most of all, I want to know who it is so I can forgive them.”

We spoke with Marterrance's father late Monday afternoon as he had difficulty putting his emotions into words.

"Every time I look at a picture, I'm in disbelief," Terrance Albury, Marterrance's father said. "It's crazy how it happened, though. It wasn't supposed to happen. Not to him. Not to nobody."

And now an entire family, including Marterrance's father, is left without their little boy.

"I gotta come to reality," Albury said. "It's what's going on. It's real life."

Anyone with information is asked to call Tampa police at 813-276-3200 or Crime Stoppers at 1-800-873-TIPS (8477), go to www.crimestopperstb.com or text “CSTB” plus the tip to CRIMES (274637).