Gangland shooting victim Euan Johnston's drug dealer father was on home leave from prison when his son was gunned down.
Euan Johnston Senior, 44, was reportedly on leave from a six-year sentence at Castle Huntly, Dundee, when his 26-year-old son was killed following a car chase in Glasgow.
Johnston Snr was jailed for more than six years after he was caught with heroin worth more than £2million.
He was arrested at a car park near Partick Thistle's Firhill Stadium.
It is believed he was at Queen Elizabeth University hospital when Johnston jnr was pronounced dead.
Euan Johnston, 26, was shot in a "targeted, planned attack" as he sat in his black Audi RS4 estate with a friend at a junction in Shields Road, Glasgow, at around 11.40pm on Tuesday.
Mr Johnston had been out for a meal with a friend, a 29-year-old man, and the pair were returning home when the attack took place in front of some members of the public when he stopped his car at a pedestrian crossing.
His attacker was travelling in a dark Audi Q5 that had pulled up beside Mr Johnston's car. No-one else was injured.
Police said the vehicle is being examined to establish if there is any link to the murder in Shields Road.
Detectives are appealing to anyone was saw a vehicle being driven at speed in the area at that time to contact them.
Detective Superintendent Jim Kerr said: "Our priority remains tracing whoever is responsible and a team of highly experienced detectives are working on this murder inquiry.
"Although we do believe that this was a targeted, planned attack and Euan Johnston was the intended target, the shooting was carried out with absolutely no regard for public safety, and I completely understand that people will be concerned regarding this.
"I would stress that everything is being done to track down whoever is responsible for this shooting, and this includes a number of officers examining CCTV footage from the area around the scene of the shooting.
"I would like to reassure the local communities that there are additional police patrols in the area and anyone with concerns should speak to officers."
He added: "We are doing everything we can to trace whoever is responsible for this murder, but we would appreciate any assistance that the public can provide, as even the smallest piece of information could be vital to our investigation.
"We have support mechanisms in place, should people feel vulnerable about contacting us, and I would urge people to do the right thing and report any information they have."
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