Real Housewives of Salt Lake City star Mary Cosby’s son Robert Cosby Jr. was arrested over the weekend.

On Saturday, the sole son of the reality TV personality was apprehended for offenses including criminal trespassing, assault, defying law enforcement commands, and breaching a court order on three separate counts.

The 21-year-old was taken into custody after police responded to a domestic violence report, per TMZ. 

According to the police report, he attempted to break into his father-in-law’s home through a dog door and allegedly assaulted someone on the front lawn.

When police arrived on the scene, the responding officer ordered Robert Jr. to get on the ground, which he initially failed to comply with before eventually being taken into custody. 

This comes as Mary opened up more about supporting her son and putting blame on herself amid his sobriety journey, which she said is a ‘hardcore road’ and led to even Rihanna personally reaching out to her.

Real Housewives of Salt Lake City star Mary Cosby’s son Robert Cosby Jr. was arrested over the weekend

This comes as Mary opened up more about supporting her son and putting blame on herself amid his sobriety journey, which she said is a ‘hardcore road’ and led to even Rihanna personally reaching out to her

His latest run-in with the police follows his 2022 DUI arrest. 

During that incident, police said he was operating a vehicle without a valid license and claimed disobeyed traffic laws. 

He ended up pleading guilty to the DUI, which led to the other charges being dropped. 

He was later caught in more legal troubles when he allegedly failed to prove that he completed a court-ordered rehab stay. 

Mary and her son previously opened up about his substance abuse struggles and mental health on the hit Bravo series. 

Mary had a heart-to-heart conversation with her son in a season five episode, in which she begged him to open up to her about his struggles. 

In the episode, which aired in November 2024, Robert Jr. confessed that he started taking drugs when he ‘just turned 16.’ 

‘At first, I was like, I’m just gonna stick to natural stuff. And then, I went to a party, and someone gave me a Xanax. And then I was like, “Oh, I like this,” so I started buying it,’ he recalled about the genesis of his drug and alcohol addiction. 

The reality TV star’s only son arrested on Saturday for criminal trespassing, assault, failure to stop at the command of law enforcement and three violations of a court order

Mary and her son previously opened up about his substance abuse struggles and mental health on the hit Bravo series

Mary had a heart-to-heart conversation with her son in a season five episode, in which she begged him to open up to her about his struggles

In the episode, which aired in November 2024, Robert Jr. confessed that he started taking drugs when he ‘just turned 16’

The following month, Mary touched on his rehabilitation stay on an episode of Watch What Happens Live in December 2024. She also said that he was doing ‘good’ on the RHOSLC reunion episode before later adding that he became a ‘new person’ with treatment

‘Then I started doing Xanax with acid and then molly with Xanax, because I like Xanax, so I mixed it with everything, Xanax and cocaine,’ he admitted on the show. 

He said that he eventually reached a ‘turnining point’ when he ‘was taking 10 [30 milligram OxyContin pills] at once, and I couldn’t even feel it. I couldn’t feel it at all.’ 

The following month, Mary touched on his rehabilitation stay on an episode of Watch What Happens Live in December 2024. 

She also said that he was doing ‘good’ on the RHOSLC reunion episode before later adding that he became a ‘new person’ with treatment.

‘Rob is doing so good,’ she said tearfully on the show. ‘I am so proud of him, so proud of him.’

Earlier this week, she hinted that he was struggling with substance issues again and said her husband Robert Cosby Sr. is ‘devastated.’ 

While making an appearance on SiriusXM’s Reality Checked radio show on Wednesday, Mary said about her son: ‘I can just only push him, encourage him and love him. And that’s what I’m doing.’

She added: ‘That’s kind of where we are … But he’s still on that road and it’s a hardcore road.’