Steven “King” Allen Jr. was on the last stop of his trick-or-treating route Tuesday night when tragedy struck.

The 4-year-old boy, dressed as the Black Panther, was on 56th Street South in Birmingham’s Crestwood neighborhood, when authorities and family said he and two others – including an infant – were struck at a high rate of speed by a vehicle whose driver did not stop.

King was with his oldest sister and her best friend, both in their 20s, and the friend’s children, including her 9-month-old son. King just turned four last week.

“That car just came up the road speeding, hit him, didn’t even break stride and kept going,’’ said Allen Sr. in an interview from Children’s Hospital where King remains in critical condition.

The crash happened near the intersection of 9th Avenue South and 56th Street South at about 7:54 p.m.

“That’s the area we’ve been going to for years because they always have big decorations,’’ said Allen, a City of Birmingham employee. “That was their last stop before they came home.”

The neighborhood is popular with trick-or-treaters, partly because of the elaborate yard decorations.

“They told me it took the paramedics almost 10 minutes to get up the street, that’s how many kids there were,’’ Allen said.

Crestwood North residents said they have long advocated for a stop sign on 56th Street at Ninth Avene, and even more so have pleaded with city officials to install a sidewalk for safety reasons. They said they’ve been told budgetary restraints have prevented the project from becoming a reality.

Allen and his wife, Anita, received a telephone call as soon as King and the others were struck. Allen said he rushed to the scene, but King had already been transported by Birmingham Fire and Rescue Service to the emergency room.

King suffered damage to his liver and kidney, a possible spinal injury, and he’s bleeding from his lungs.

On Wednesday, he was still on a ventilator but was awake, though heavily sedated.

“He will shake his head and give a thumbs up,’’ Allen said. “I asked him if he wanted to go fishing, and he shook his head yes.”

King remains in the Intensive Care Unit.

“It’s touch and go,’’ his father said. “They’re still trying to figure it all out.”

“We just had about 12 doctors come in and I asked them with him being 100 percent before he got hit to now, where is he?’’ Allen said. “And they couldn’t tell me.”

The 25-year-old woman and her infant son sustained non-life-threatening injuries.

Allen said an officer came to check on King at the hospital Tuesday night because she was so upset by the incident. He said they have not received any word from detectives on a possible update in the case.

Birmingham police believe the suspect’s vehicle is a dark colored Audi A3, built between 2009 and 2012, with a damaged rear view passenger mirror.

Allen said he and is family are pleading with the driver to come forward.

“If you’ve got any kind of conscience about yourself or any remorse for human life, you’ll turn yourself in,’’ he said.

They are asking anyone with information to come forward as well.

“Somebody had to see something,’’ Allen said. “And if not, there had to be a camera or doorbell camera or something.”

Anyone with information is asked to call Crime Stoppers at 205-254-7777. A cash reward of up to $5,000 is being offered in the case.