Saturday Night Live writer Jimmy Fowlie's missing sister has been confirmed dead, he wrote in a heartbreaking post on social media Wednesday.

Fowlie, 40, - who joined SNL's writing staff in 2022 and co-wrote the viral 'Domingo' sketch - has said he last saw his sister, Christina Lynn Downer, 38, at the end of November.

In an update posted to his Instagram account on Wednesday, Fowlie wrote that his sister is 'no longer alive.'

'The LAPD has informed our family that Christina is no longer alive and the case has officially transitioned from a missing person to a homicide investigation,' he said in a statement.

'Our prayers for her to be found safely have transformed into prayers for the truth to be revealed and for those responsible to be held accountable.' 

Fowlie also said he and his family 'have reason to believe that in the weeks before she went missing, her phone and social media were compromised.

'The individual[s] in possession of her phone used it to hide the fact she was gone to ask for money and to create a false narrative that she was going "off the grid,"' the comedian claimed.

A review of Downer's Instagram page showed a new post weeks after she was reported missing.

'Living life in peace,' Downer posted on December 14. 'If you wanna send me a Christmas treat, I'll be waiting. Happy holidays everyone.' 

But the same photo was posted to Downer's Instagram story in June and saved as a highlight on her profile, The US Sun reports. 

In Fowlie's statement on Wednesday, he said he is sharing his concerns 'because I believe that whoever is responsible is hoping to erase her in every way possible.

'I want to amplify her story in the only way I know how,' he explained. 'And to express that she was a beautiful person who matters in this world, especially to me.' 

'I also believe there is a chance that someone who knows something might find the courage to step forward,' Fowlie continued.

'My sister can no longer advocate for herself, but I can and I hope you will too,' he wrote, explaining: 'The best way you could support me in this moment is to share this post and to talk about her story.' 

The comedian also shared several photos of his sister over the years, including photos of him and her as young children and at her wedding.

In the caption, Fowlie thanked everyone 'for all your continued support during this terrible time.'

'I'm gonna take a step back from social media due to the intense overwhelming feelings,' he then announced. 'Please take any info you may have directly to [the] LAPD and not me.' 

The heartbreaking post came just days after Fowlie said there were 'no updates I can share' as he said he was 'thinking about her every day.'

He previously also shared an official missing persons bulletin on December 22, including two photos of Downer, whom the police department described as being five-foot-one-inch with brown hair and brown eyes.

'My sister has been missing and we are worried that she isn’t safe,' Fowlie wrote at the time.

Fowlie also noted that Downer is rarely seen without her dog, a miniature pinscher named Rex.

'If you see her, chances are he'd be with her,' the comedy writer posted.

The post was then shared by numerous past and present Saturday Night Live colleagues, including Chloe Fineman, Ego Nwodim, Heidi Gardner, Bowen Yang and James Austin Johnson. 

Fowlie’s work extends beyond Saturday Night Live, with credits including Netflix’s A Nonsense Christmas with Sabrina Carpenter. 

He has also starred in and written projects such as the comedy web series Go-Go Boy Interrupted and HBO Max’s The Other Two.

The Daily Mail has reached out to the Los Angeles Police Department for comment. A spokesperson for the department had confirmed earlier on Wednesday that Downer was still reported missing.