Peel Regional Police have charged four people in connection with the death of Jason Ramkishun, an innocent man who was shot to death while driving on Highway 410.

Ramkishun was driving home from his job as a security officer on Nov. 13, 2018 when he was killed.

Police say he was not the intended target of the two men who opened fire, but was driving a Honda Accord, the same vehicle the intended target was driving.

On Nov. 10, 2018, police say an altercation broke out on Delmonte Cres. in Mississauga, where a 24-year-old opened fire on a male victim. The victim fled unhurt in a 2013 Honda Accord.

"We believe this incident was the catalyst for what came next," Insp. Marty Ottaway told reporters.

Three days later, Ramkishun was driving in a 2014 Honda Accord when a vehicle pulled alongside his car and the occupants opened fire. Ramkishun was found suffering gunshot wounds and taken to a trauma centre where he was pronounced dead.

Police have now arrested two GTA brothers in connection with the deadly shooting who they say are involved in gun and gang crime.

Adrian Williams, 25, no fixed address was charged with first-degree murder and attempted murder.

Akeem Williams, 28, of Toronto was charged with attempted murder.

"As a young man, [Ramkishun] had aspirations of entering law enforcement and had a great presence within his family and community," Chief Nishan Duraiappah said.

"This has been a tragedy for the family and friends and they miss him terribly," said Ottaway.

Meanwhile, police also said a 26-year-old Markham woman was charged with being an accessory after the fact, while a 26-year-old Milton woman faces a criminal charge for drug possession with the intent of trafficking.

Over the course of their investigation, police say they found the four accused and others associated with them "were involved in crimes related to guns and gangs."

Fifteen people were arrested in the process and are facing over 115 firearms-related charges.

Police seized various firearms during the investigation, including a .45 calibre handgun, two 40-calibre handguns, five nine-millimetre handguns and a 22-calibre assault rifle.

The investigation is ongoing and anyone with information is asked to call investigators at 905-453-2121 ext. 3205 or leave an anonymous tip with Crime Stoppers by calling 1-800-222-TIPS.