Mr Cowdroy died from serious injuries sustained in an horrific car accident near Tamworth last week.

The talented musician died in Newcastle's John Hunter Hospital intensive care unit at 3.30pm without coming out of a coma.

Mick received his first guitar at the age of 14 and started guitar lessons at Turramurra Music under the guidance of the legendary Dave Lynch, and with fellow band mate Todd Atkinson planted the seed that would become Southbound.

Southbound band manager and close friend of the musician, Doug Trevor, was yesterday reeling from the news of Mick's death.

"We're all in shock and deeply saddened at the moment and just can't believe this has happened to such a promising singer, songwriter and musician," Mr Trevor said.

"Mick was a great guy and extremely passionate about his music and wanted to involve himself in more of the band's writing.

"The remaining members of Southbound, Todd, Mark, Terry and Mark, are extremely devastated and saddened over the loss of their close friend and fellow band mate.

"All those who knew Mick loved him as a person and admired, respected and enjoyed his outgoing personality as an extremely talented musician."

Mick was travelling from his home in Pymble to Tamworth on Thursday where the band was schedule to play, when the accident occurred at about 10.15pm.

He was airlifted from Tamworth Base Hospital to Newcastle's John Hunter Hospital intensive care unit after his early model Toyota Corolla crashed into a tree and rolled 350m where he remained in a critical condition.

The 33-year-old guitarist and vocalist, along with fellow band members Todd Atkinson, Mark Chamarette, Terry Joyce and Mark Thomas, recently featured on the popular Australian television program Good Morning Australia performing their latest single You Don't Need the World.

It is believed that Mick was planning to move to Tamworth, where Southbound's popularity is probably greatest with the band making regular visits during their busy touring schedule.

"He was one of the driving forces and real characters behind Southbound, and it is such a terrible tragedy to lose someone with the incredible talent that Mick possessed," Mr Trevor added.

"Australian country music is the poorer for his premature death and will definitely feel the loss of a great musician and integral part of one of the country's prominent country rock band.

"Our deepest sympathies go out to Mick's family, to Todd, Mark, Terry and Mark of Southbound and to the many fans who will miss him."