Mystery as University of Missouri student, 22, vanishes after 'getting kicked out of bar in Nashville' as eerie CCTV footage shows him stumbling along street

Police have released surveillance footage of a Missouri college student's last known movements before he went missing on a bar crawl four days ago. 

Riley Strain, 22, was last seen on Friday night at Luke's 32 Bridge Food + Drink on Broadway, per the Metropolitan Nashville Police Department.

The Delta Chi fraternity member from the University of Missouri had traveled to Tennessee on a group trip for their annual spring formal. 

His friends told local media they last saw him around 10pm local time after he was booted out of the bar for undisclosed reasons. 

Metro Nashville PD told DailyMail.com his last movements on surveillance footage were on Gay Street close to the Cumberland River. 

The department later released a 44-second clip showing him walking across the street in a two-tone shirt, stumbling and appearing confused. 

Riley Strain, 22, was last seen on Friday night at Luke's 32 Bridge Food + Drink on Broadway, per the Metropolitan Nashville Police Department

Police have released surveillance footage of a Missouri college student's last known movements before he went missing on a bar crawl four days ago

Police have been using a helicopter to scour the downtown Nashville area, including the riverbank. 

Riley's stepfather Christopher Whiteid said he told his fraternity brothers he was on his way back to their hotel as he left the bar. 

However, he never returned and his worried friends couldn't find him using his Snapchat location, while their phone calls went to voicemail. 

They reported him missing on Saturday and authorities launched a search. 

His last cellphone location was recorded between Gay Street and James Robertson Parkway close to the bar where he was last seen, according to WKRN-TV. 

Police have attempted to locate his phone but have drawn a blank, while also checking local hospitals and jails. 

His stepfather said surveillance footage indicated that he might have taken a wrong turn on his way back to the hotel. 

Riley's mother Michelle Whiteid said he's 'a great kid' and normally 'very communicative'.  

'We miss him and we want him back so bad,' she told WKRN-TV.

'He's always texting me, calling me, FaceTiming me,' she added. 'He's always in touch with me. He's very communicative.'

Photographs of the missing student have been widely shared on social media.  

Riley has been missing since Friday night and his worried friends and family have shared photographs of him on social media in the hope someone with information will come forward

Missouri college student Riley Strain has been missing four days after friends say he was kicked out of a Nashville bar.

In an appeal for information about Riley's whereabouts, Nashville Metro PD described him as '6'5' tall with a thin build, blue eyes and light brown hair'.

Anyone with information is asked to call police on 615-862-8600. 

The University of Missouri has released a statement saying they've 'been in touch with the family and authorities in Nashville' who are working to find the student.  

'The safety of our community is our highest priority,' said Angela King Taylor, interim vice chancellor for Student Affairs. 

'Our thoughts are with Riley's family as the search continues. We will be offering any support to them that we can, and we encourage anyone who needs help to reach out to our counseling resources.'