His little body is broken after he was flung through the air in a hit-and-run accident which left him brain damaged, wheelchair-bound and blind.
The five-year-old is now back in nappies, he eats through a tube and struggles to speak.
It's a far cry from the cheeky chappy who was such a computer whizz, nursery staff called him Bill Gates.
"What must he be thinking," says mum Sonia Eggett. "He's gone from seeing for four years to this."
While the family have no idea whether their child will ever walk or see again, speeding driver Ricky Walker, 25, has been jailed for 16 months.
Leeds Crown Court heard the father-of-one struck Tyler who was dressed in his Spiderman outfit as he played with a ball with friends.
Witnesses described Walker's driving before the crash, at 4pm on February 13, as "stupid" and "crazy".
Walker told police he didn't hand himself in because he wanted to "get Valentine's Day out of the way first".
He fled the scene after smashing into Tyler who had run out from between two parked cars on Lees Hall Road, Thornhill, Dewsbury.
Tyler was catapulted through the air and landed 70ft away. Sonia, 33, raced out to see her son being resuscitated.
A passer-by – who the family now affectionately call Barnsley Mark – had stopped to give the youngster mouth-to-mouth and heart massage.
"He brought Tyler back to life. I was just stood there in shock," said Sonia.
The family nominated Barnsley Mark for a Royal Humane Society award which grants awards for acts of bravery and saving lives.
Mark has visited Tyler every fortnight since the accident and they presented him with the award on the youngster's fifth birthday last month.
Sonia looks tired and frail. Together with Tyler's dad Antony Jessop, 23, the couple have been at the hospital every day.
Antony had to give up work so the couple could spend all their time with Tyler as well as looking after three other children Emily Viney, 10, Molly Viney, eight and Joshua Viney, six.
Sonia told the YEP: "We have been in the hospital day after day. To me life's just got that little bit harder and we are hoping things will improve. He's made such great progress. They did not think Tyler would make it."
Antony says it is heartbreaking to watch his son trying desperately to move and speak.
"He's still there but he's physically disabled which makes him so frustrated. He's got a damaged vocal chord so it's difficult to understand him and he will get so agitated. We just don't know if he will ever see or walk again. He has physio every day. He has to have a drain in the back of his head to drain away fluid and that will be permanent."
Tyler currently goes back to the family home in Pioneer Street, Thornhill Lees, for a few hours at the weekend but they hope to have him back permanently for Christmas.
Accident investigators estimated Walker was travelling between 32mph and 38 mph when he struck Tyler.
Walker admitted dangerous driving, failing to stop after an accident and driving without insurance.
Judge Geoffrey Marson said: "What you did thereafter was a cowardly thing whether or not you knew you had hit a child.
"You knew you had hit something and you knew you should have stopped. You went on for your own selfish reasons because you knew you had no insurance."
The court heard Walker's girlfriend's stepfather reported the incident to police after seeing a TV appeal.Walker, of Spa Street,Ossett, was jailed and banned from driving for three years.