The blue pick up truck jumped the curb and headed straight at him so Sherrik Farmer Sr. moved. He pushed his fiance out of the way, then tried desperately to do the same for his 1-year-old son in a stroller. The next thing he knew, Farmer said Saturday, he was “flying in the air,” and praying his efforts had not been in vain.

Farmer said he hit the ground and blacked out momentarily. When he opened his eyes he saw his son’s lifeless body about 30 yards away. He said he tried to crawl over, fighting the pain in his own legs.

“I keep picturing that moment in my head over and over again, just seeing my little baby boy,” Farmer said. “It breaks my heart.”

The public account is the first Farmer has given about the Thursday crash in the 5100 block of St. Barnabas Road that killed his 1-year-old son, Sherrik Farmer Jr., and seriously injured him. He spoke via phone from Prince George’s Hospital Center, where he said doctors had put a rod in his broken left leg.

Farmer, 24, said he, his son and fiance Tanisha Williams were out for a walk along St. Barnabas Road, headed generally toward his Williams’s mother’s house in the Marlow Heights area when the accident happened. Farmer, who lives in Woodbridge, said he frequently stayed with Williams, who lives with her grandmother not far from the accident, and she and their son visit him in Virginia, too.

Traffic seemed normal, Farmer said, until he spotted the blue pickup truck head directly at him on the sidewalk. He said he pushed Williams, 21, to safety, then “tried my hardest to push my son out the way.” He said as the truck hit him, he thought he might have been successful.

“I really wish my son could take my place so he could be alive right now,” Farmer said. “I just want my boy back, and I can’t do anything about it.”

Farmer said his son was “just a great boy,” who loved to play and chat with anyone who would listen. His fiance said young Sherrik had a healthy appetite and loved to dance to cell phone ring tones.

“He came out exactly the way I wanted him to come out,” Farmer said. “I miss him so much.”

Police have said the truck’s driver, a 60-year-old District man who authorities declined to name, remained on the scene after the incident, and detectives are looking into whether charges against him are warranted. It remains unclear why he left the roadway.

As is routine in fatal crashes, the investigation could take weeks, and ultimately, prosecutors will decide what charges, if any, are appropriate, police said.

Farmer said that from his perspective, the truck was “not going the speed limit.” He said he also questions why its driver did not seem to hit the brakes or swerve in either direction away from him and his son.

“I thought he was some crazy guy, trying to hit us,” Farmer said. “I mean, I really don’t wish bad things on people. I’m just so confused on this situation.”