Hi Gaby,
I did some more searching and I think this is him. (The John who died in 1996, was born in 1955). My deepest sympathy to your friend.
http://www.lifenews.ca/durhamregion/profile/262241--jan-wisn... WISNIEWSKI, Jan - Peacefully passed away at Lakeridge Hospital Oshawa on July 23rd, 2009 in his 96th year– Dear father of Christine Mamajek and her husband Joseph– Grandfather to John and Andrew– Jan was an employee of General Motors for over 25 years and a member of St– Hedwig's Parish– We would like to thank Dr– Callow for his dedication over the years, Susan Sheriff, his nurse, for her kindness, patience and professionalism, and all of the nurses on the 8th fl oor at Lakeridge Health Oshawa for their dedication, support, kindness and understanding– We would like to thank the staff at the Oshawa Funeral Home for their kindness and support through this diffi cult time– Friends were received at OSHAWA FUNERAL HOME, 847 King Street West (905-721-1234) for visitation on Sunday, July 26th from 2 - 4 and 7 - 9 P–M– Mass of Christian Burial was held at ST– HEDWIG'S ROMAN CATHOLIC CHURCH (411 Olive Ave–, Oshawa) on Monday, July 27th at 10:00 A–M– Interment followed at Resurrection Cemetery in Whitby.