The bassist passed away over the weekend (ends24Jan16), according to Def Leppard guitarist Vivian Campbell, who performed with him in both Dio and their new band, Last in Line.

While Campbell did not disclose the cause of his friend's death, he paid tribute to Bain in a touching post on

He wrote, "It's with the heaviest of hearts that I must confirm the news of the passing of our dear friend and Last In Line band mate, Jimmy Bain. It was Jimmy who gave me my first big break in the music industry and for that I am forever indebted."

"Jimmy's struggles with his demons were well documented through the years, but over the last 18 months he had finally won that battle and he was bright and lucid and motivated throughout the writing and recording of the new record," Campbell continued. "He leaves behind him a rich legacy of work from Rainbow, through Wild Horses, Dio, and finally, Last In Line. Jimmy was immensely proud of our new album and his input to it was immeasurable. He was a very kind and gentle and generous soul and our lives were greatly enriched for having known him. We will continue to celebrate his life through his music."

Bain started his career playing in a number of bands in his native Scotland before moving to London. Soon after, former Deep Purple star Ritchie Blackmore recruited him to join Rainbow, alongside singer Ronnie James Dio.

They forged a friendship, which led to Dio hiring Bain for his self-named band in 1983. He left the group in 1987, but rejoined in 1998, until Dio's death in 2010.

Bain and former members of the original lineup of Dio, Campbell and Vinny Appice, came together to create Last in Line in 2012. Bain had been performing with the band and the surviving members are still slated to release a new studio album next month (Feb16).

Last in Line was scheduled to perform on Def Leppard's Hysteria on the High Seas cruise from 21 to 25 January (16), but it is unclear whether Bain was on the ship at the time of his death.

Since news of his passing broke, members of the heavy metal community have taken to social media to share their condolences, including Megadeath's Dave Mustaine, who tweeted, "Jimmy Bain has passed away. I'm saddened by the loss of my friend. David (Megadeth bassist) & I were very close with Jimmy. Godspeed. Its (sic) weird when the friends you know and the people you listened to growing up start dying."

Velvet Revolver drummer Matt Sorum wrote, "We've lost another great Rock N Roller", while Motorhead's Phil Campbell added, "Jimmy Bain was a true musician and songwriter. He was involved and wrote more than you probably imagine."