PARENTS who were quizzed on their son's disappearance 29 years ago have revealed that he was "happy" after meeting a new girlfriend just days before he went missing.
His parents Doris and Charles Clark were arrested after a cold case review in September last year.
They were later released without charge.
Charles, 78, said his son had just met a new girlfriend who he was "happy" with.
He told the Mirror: "This relationship with the girl lasted about a week or 10 days. He liked to go to the local, she was there, they were about the same age.
"It was days before he went missing."
Charles and his wife Doris, 81, don't believe the new girlfriend was involved in their son's disappearance.
Cops believe Steven met the girl at the Rathbone Society, an organisation which worked to help disabled people get employment.
This relationship with the girl lasted about a week or 10 days. He liked to go to the local, she was there, they were about the same age.
Steven was left with a permanent limp and a damaged arm when he was hit by a lorry as a two year old.
In an upcoming ITV documentary on the case, Doris is shown in tears when she gets a letter from police saying her and her husband were freed from bail.
However the letter also said they are still under investigation and could be reinterviewed.
"The nightmare continues," Doris said.
"We are innocent. Your mind plays tricks. It was a horrible world out there even 30 years ago so you do think of the worst that could happen."
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Since Steven's disappearance there have been two alleged sightings of him, including one at around 3pm on the same day he was last seen.
Doris said: "That is the time that the police suggested we murdered him. They said we had about an hour to have done away with him. It is ridiculous."
Cleveland Police say they have no records of any confirmed sightings of Steven since he went missing.