Actor Christopher Lawford, the nephew of the 35th US President John F. Kennedy, passed away at the age of 63. On Wednesday, his cousin Kerry Kennedy took to Twitter to announce the sad news.

He posted a few photos of Lawford from the 2004 Democratic National Convention along with his son, David. He wrote, "We mourn the loss of my cousin Christopher Lawford, Rest in Peace. Pictured here with our family at the 2004 Democratic Convention and with his wonderful son, David."