Family members of slain U.S. Air Force mechanic Jaelen Chaney, who was fatally stabbed by his partner in a suspected double murder-suicide, are preparing to say goodbye after his tragic death on April 8. Fifty donations have been made toward a GoFundMe launched in his honor, RadarOnline.com has learned, raising more than $3k of a $5k goal to help cover travel as well as burial and memorial costs to alleviate their financial burden while facing a devastating loss. Chaney’s body has been released to loved ones, according to online records from the Los Angeles County Department of Medical Examine…