A 68-year-old woman from Amsterdam has been arrested for the 1995 murder of Henny Grannetia, whose violent death in his home had remained unsolved for nearly 30 years, police said on Thursday.

Grannetia, 57, was found dead on 7 March 1995 in his flat on Kijkduinstraat in Amsterdam-West. He had been bludgeoned about the head and strangled.

The breakthrough came after the cold case team re-examined blood traces found on a pair of shoes seized from the woman in 1995. At the time of the original investigation, the woman had already been arrested in connection with a separate murder committed just days earlier.

On 26 February 1995, a 66-year-old German man was found dead in a hotel room on the city’s Haarlemmerstraat. The woman, who according to newspaper reports at the time, worked as a prostitute, admitted to stealing money and drugs from the victim but was later acquitted of murder.

The Netherlands Forensic Institute (NFI) has now compared DNA from Grannetia to the blood traces found on her shoes and found a match Police said the DNA match, along with supporting witness statements and other traces pointing to the same suspect, led to this week’s arrest.

The suspect remains under investigation but was released from custody by the examining judge on Tuesday due to medical reasons.