A series of road accidents across Scotland has taken the death toll to six in less than a week.
A third motorcyclist died in the latest of the unconnected deaths.
Police said Scott Forbes, from Dundee, was travelling west on the A85, around a mile and half from Lochearnhead in Stirlingshire, on Saturday on his Honda CBR Fireblade when he was involved in a collision at around 1.15pm.
The 49-year-old sustained significant injuries and was treated at the scene but died a short time later, Police Scotland said.
Road policing officers closed the road for about six hours while they carried out an investigation at the scene.
Sergeant Ruth Aitchison, from the road policing unit in Stirling, said: "This has been a tragic incident where a motorcyclist has sadly died.
"We are currently working to establish the circumstances surrounding this incident and ask that anyone who was on the A85 on Saturday afternoon and believe they have information relevant to this investigation, please contact us."
It is understood police are investigating whether another vehicle was involved or not.
Mr Forbes' motorcycle is described as white with red and blue markings.
The crash happened around an hour after a 27-year-old motorcyclist was also killed in a collision with two cars in Aberdeen.
That accident, which happened at around 12pm on Great Northern Road, involved a black Yamaha bike, a black Vauxhall Adam and a silver Volkswagen Caravelle.
Sergeant Malcolm Kinross, of Police Scotland's north east division road policing unit, said: "We are dealing with a tragic incident and our thoughts and condolences are with the family and friends of the motorcyclist.
"At the time of the accident the road was busy and I believe a number of people may have seen the accident or stopped at the scene of the accident."
The fatalities on Saturday follow the death of motorcyclist Ross Quinn, 23, on the A737 in Beith on Wednesday.
Mr Quinn, from Kilwinning, was riding an Aprilia bike that collided with a Mercedes sprinter and a BMW 3.
Emergency services were called but he died at the scene.
Two young men also died in a crash in Strathaven, South Lanarkshire, on Wednesday.
The following morning, a father-of-two died on his way to work in a collision with a lorry in Aberdeenshire.
In another roads incident at the weekend, a police van was involved in a crash with a car.
There were no serious injuries in the collision with a white Vauxhall Astra on the A947 Turriff to Banff Road at around 8.40am on Sunday morning.
The 26-year-old driver of the Vauxhall will be reported to the procurator fiscal, Police Scotland said.
The charity Brake, which campaigns for safer roads, said in June that more should be done to help reduce fatalities and casualties.
Lucy Amos, research advisor for Brake, said as figures were released showing a slight decrease in fatalities but an increase in bike deaths: "Vehicle traffic has been steadily increasing for the past few years; action must be taken now to prevent the numbers of vehicles overwhelming safety measures.
"The increase in motorcycle deaths last year is a clear indicator that something must be done now to secure the safety of vulnerable road users in particular."
She said Brake is calling for the "reintroduction of ambitious casualty reduction targets to act as a driving force for the fight against road death and injury at the national level".
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