The co-defendant of British technology entrepreneur Mike Lynch, who is still missing after a superyacht sank off Sicily, has died in a collision with a car, police confirmed.

Stephen “Steve” Chamberlain, 52, died in hospital on Saturday, August 17, after being hit by a car in Cambridgeshire, England, authorities said in a statement on Tuesday, August 20. Local police are currently investigating his death and are looking for witnesses to the incident.

Authorities had previously reported that a pedestrian in his 50s was “seriously injured” in the collision, which occurred around 10:10 a.m. on Saturday. The driver of the car was confirmed to be a 49-year-old woman who “remained at the scene of the accident.”

The Guardian reports, citing his attorney Gary Lincenberg, that Chamberlain was jogging at the time of the collision.

Cambridgeshire Police released a statement from Chamberlain’s family offering their condolences: “Steve was a beloved husband, father, son, brother and friend. He was an amazing human being whose sole aim in life was to help others in any way he could. … He will be greatly missed but he will remain forever in the hearts of his loved ones.”

Chamberlain was a co-defendant with Lynch in a US trial involving his tech company Autonomy. He was accused of fraud and conspiracy because he and Lynch allegedly inflated the company’s profits ahead of an $11 billion deal with Hewlett-Packard. The timesTechCrunch and Associated Press.

The former business partners were acquitted of all 15 charges by a jury in San Francisco in June.

After Chamberlain’s death, his lawyer Lincenberg described him as “a courageous man of unparalleled integrity.”

“We miss him deeply,” Lincenberg said, according to the BBC. “Steve successfully fought to clear his good name in court earlier this year and his good name now lives on through his wonderful family.”

Lynch, along with his daughter Hannah and four others, remain missing after the yacht they were on sank off the coast of Sicily on Monday, August 19, following a severe storm, PEOPLE previously reported.

The Italian Coast Guard said in a statement seen by PEOPLE that the Bayesiana 183-foot British-flagged yacht, sank near Porticello at around 5 a.m. local time on Monday following a “violent storm.”

According to authorities, there were 22 people on board the ship at the time, including ten crew members and twelve passengers.

Lynch’s wife, Angela Bacares, was among the 15 people rescued, PEOPLE reported. Six other people – including two Americans and four British citizens – remain missing, according to the Coast Guard and local sources.

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A spokesman for the Sicilian civil protection authority, Francesco Venuto, had previously told the BBC that the authorities assumed that the missing people were trapped in the yacht.

“We searched all day with helicopters and boats. We found nothing,” said Venuto. “It wouldn’t make sense. Under these conditions, we should have found something by now.”