Mr Purdie came from the Castle Douglas area and died after his black coloured Triumph motorcycle left the roadway and collided with a wall.
At 11.31 pm on Wednesday Police Scotland were informed of a road traffic collision on the C1S, Old Military Road, approximately one mile outside of the town.
Emergency services attended and found the male rider of a black coloured Triumph motorcycle had died at the scene.
The road was closed to allow collision investigation to take place and re-opened at about 4.50 am yesterday.
PC Hazel Smyth of the Road Policing Unit said: “We are carrying out a full crash investigation into this collision and would ask that anyone who may have witnessed this RTC get in touch with us.
“We are particularly keen to speak with anyone who may have travelled the Old Military Road between 4.30 pm and 11.30 pm on Wednesday May 10.
“Anyone with information can contact Roads Policing Unit at Dumfries on the 101 number quoting incident reference PDG0107280517 or PS20170510-4240.”