A product of Dundee Eagles, Walker first linked up with the Scotstoun outfit ahead of the 2019/20 season before graduating from the club's senior academy in January 2022.
Walker made his pro debut by coming off the bench in a 35-24 victory over the Hollywoodbets Sharks at Scotstoun in October 2021.
His first start in Glasgow colours came in a 30-17 win over Edinburgh at Scotstoun, and he's gone on to make 11 appearances for the club to date, as well as representing both Glasgow Warriors A and Stirling Wolves in the FOSROC Super Series.
A Scotland cap at U18 and U20 level, he made his senior international debut in the 2022 Autumn Nations Series off the bench against Fiji, before winning his second cap a fortnight later against Argentina at Scottish Gas Murrayfield
Speaking on The Squadcast, the official podcast of Glasgow Warriors, about his new deal, Walker said: "It was an easy decision to re-sign with the club, really.
"It's been a strange couple of years, as it's been so long since I've played a professional game for the club because of injury lay-offs and so on, but at the same time I've played for Scotland last summer and been involved with the A team.
"The overriding emotion for me when it comes to the last two years as a Warrior has probably been frustration to be honest, just because of the run of injuries and when they've come about, so when it came to it, renewing was such a straightforward decision. I want to put my best foot forward, and I feel like I owe everyone - from the boys to the coaches to the supporters - and show them all what I can do and what I've been working on.
"I just want to get back to playing rugby and playing well, and giving everything for this club. I can't wait to be back out there in front of the supporters once more."
Head Coach Smith added: "We are pleased to have secured Murphy's services for another couple of seasons.
"Whilst he has endured his share of bad luck with injuries, he has worked extremely hard with our medical and S&C teams to get back to full fitness and put himself in the best possible position.
"He has shown he is willing to do whatever it takes to become the best version of himself on and off the field, and we look forward to continuing to work with him."