The preppy Princeton, New Jersey man who allegedly killed his younger brother in the family’s upscale apartment also set the family cat on fire during the attack, a law enforcement source tells The Post.

A former college soccer player is accused of killing his younger brother and a cat, New Jersey prosecutors announced Monday, Feb. 24. The Mercer County Prosecutor’s Office said charges have been filed against Matthew Hertgen, 31, for first-degree murder and weapons offenses in connection with the death of his 26-year-old brother, Joseph Hertgen.

New Jersey authorities have arrested Princeton man Matthew Hertgen, who is accused of killing his brother, Joseph Hertgen, and a cat, allegedly with a knife and golf club.

The preppy Princeton, New Jersey man who allegedly murdered his younger brother and butchered the family feline inside their luxury apartment posed with an $8 cat toy the day before the gruesome killings.

Matthew Hertgen allegedly killed his younger brother, Joseph, and is now facing various charges including first-degree murder and one count of animal cruelty.

The Princeton, New Jersey, man accused of killing his former college athlete brother and a cat posted eerie messages to social media months ago.

A former college soccer star is being charged with killing his younger brother and the family cat in an apartment near Princeton University. Matthew Hertgen, 31, is in police custody in Mercer County,

The New Jersey man who allegedly beat and stabbed his younger brother to death in a ritzy Princeton apartment posted a creepy poem to social media that included a

A former college soccer star has been charged with killing his younger brother and a pet cat inside a New Jersey apartment complex near the Princeton University campus, according to officials.