Kratz's cousin, Cosmo DiNardo, pleaded guilty to the crimes last year and is now serving a life sentence.
Kratz is charged with helping DiNardo kill and bury four young men in the summer of 2017.
The victims were found on DiNardo's family farm in Solebury Township.
DiNardo pleaded guilty last year and is serving a life sentence.
Kratz rejected a plea deal at the last moment.