Disturbing moment autistic child, 15, is beaten up by controversial Oklahoma cop who restrained and arrested dad for taking son for a walk

An Oklahoma police officer who restrained and arrested a dad for taking his son a walk is also facing a probe after footage emerged of him beating an autistic child.

Officers were called to the home of Andrea Lambert on June 2 after her autistic son Santiago, 15, threatened family members with a knife.

Lambert says she has called police numerous times in the past to help de-escalate tense moments involving her son as she has spinal issues. 

After filing a request for the body cam footage of the incident after discovering bruises on her son, Andrea told News9 she was disturbed at what she saw. 

In the footage, her son can be seen being punched across the face numerous times by the unknown officer as he screams. 

In the footage, her son can be seen being punched across the face numerous times by the unknown officer as he screams

The officer who punched Santiago, seen here, has also been investigated after body slamming a father who was out walking with his son

The officer, who is standing over the young boy, can be heard telling him: 'Let me show you how this is going to go.'

He then proceeds to flip the child over so he is upright and proceeds to punch him three times in the face. 

After a struggle the officer's body camera goes out but the sound of the child being hit continues as he bursts into tears. 

The footage then shows the two officers leaving the home with Santiago who was placed in in-patient for eight days and put on better medication.

As the officers return to speak to Andrea, the officer can be seen admitting: 'Ma'am, I hate it, but I mean I just punched him three times. 

'I didn't hit him full force just three times, so he understood', to which Andrea can be seen agreeing with. 

Despite agreeing with the tactics at the time, Lambert later watched the video and disagreed with how her son was treated. 

The footage then shows the two officers leaving the home with Santiago who was placed in in-patient for eight days and put on better medication

Speaking with News9, she said: 'I said all of that in a moment of vulnerability to men I thought were there to help.

'You cannot say that a grown person that has children can look at another man in a uniform doing this to a 15-year-old autistic child and say that it's okay. I'm not going to stop until I get justice for my son.'

The incident is now being investigated over use of force involving the unnamed officer. 

On July 4 that same officer was caught on body cam footage slamming father John Sexton to the ground while out walking his autistic son early that morning. 

The two officers, who both wore body cameras, captured the tense few moments between the cops and Sexton, who told officers they were 'just walking around'. 

According to Sexton, the morning walk is something that he and his young son do regularly. 

Despite his protests, one of the officers can be heard forcibly telling the dad: 'No you're not. Give me your ID.'

The officer can be heard telling him: 'I'll take you to jail for failure to identify', before the officer then body slams Sexton the ground and detains him

Sexton then turns out the pockets of the shorts he is wearing, telling them: 'I don't have my ID on me because it is at the house.'

The officer can be heard telling him: 'I'll take you to jail for failure to identify', before the officer then body slams Sexton the ground and detains him. 

His young son can be heard wailing in the background as the violent scene unfolds in front of him. 

According to Sexton, his young son has never been the same since the incident in early July 

Speaking with KOCO, Sexton told the outlet that he is now looking to press charges against the officers. 

According to Sexton, his young son has never been the same since, saying: 'He's been a cop for Halloween for the last two years. 

'That's what he's been wanting to be when he grows up. That's what he says, and now he's scared of them.

'I mean, it's horrible to see my son act, you know, crying like that and just having my rights violated like that.'

Watonga Police Chief Beth Massey said in a statement: 'The officer is on administrative leave. 

'We have no comment on the ongoing investigation. It is being conducted by an outside agency.'