Police have launched a murder investigation after the body of a 27-year-old was found in the car park of an Angus nature reserve.
Officers said Steven Donaldson was the victim of a "sustained and brutal attack".
Mr Donaldson's body was discovered by a member of the public at the Loch of Kinnordy nature reserve at Kirriemuir at 05:00 on Thursday.
Officers have imposed a no-fly zone over the scene for "common decency".
No aircraft, including drones, will be allowed to fly over the Kirriemuir area as a result of the order.
Police appealed for anyone who was in the area between Tuesday and 05:00 Thursday to contact them.
They said family and friends of Mr Donaldson are being supported by specialist officers.
'Brutal and sustained'
An extensive investigation is ongoing and officers are reviewing CCTV footage and carrying out house-to-house enquiries in an effort to gather more information.
Det Supt James Smith said: "A post mortem examination has established that Steven was the victim of a brutal and sustained attack.
"His attacker(s) must be traced as a matter of urgency and I urge the public to assist me with this investigation, to find who was responsible.
"Officers have been speaking to motorists and members of the public on the B951 Kirriemuir to Kirkton of Kingoldrum road yesterday evening (Thursday 7 June) in an effort to establish in they had witnessed anything suspicious."
Police believe Mr Donaldson travelled from Arbroath to Kirriemuir during the evening of Wednesday 6 June in his white BMW 1 series, with the private registration S73 VED.
They are keen to speak to anyone who may have seen this car in the Arbroath or Kirriemuir areas that evening.
Det Supt Smith said: "We are particularly keen to hear from anyone who was driving in the area between these dates, and has a dashcam.
"You may have captured footage which may be useful to our enquiries and we would like to hear from you."