Matthew Hertgen, 31 — who wore a suicide vest during a virtual court appearance earlier in the day — tried to take his own life behind bars

A New Jersey man who is accused of sadistically killing his brother and trying to eat his eyeball attempted suicide inside Thursday, according to a report.

Officers also found a bloody knife, fork and plate near victim Joseph Hertgen’s body, the source said — which has led cops to believe accused killer Matthew Hertgen, 31, consumed the missing