A jilted boyfriend chased his au pair girlfriend down a suburban New Jersey street before fatally stabbing her minutes after killing her boss - and then tried to flee the United States using money borrowed from his mom.

Joseph Porter, 27, of Elizabeth, New Jersey, was booked on two counts of murder and weapons possession in the deaths of his girlfriend, Karen Bermudez-Rodriguez, 26, and her boss David Kimowitz, 40, according to a press release from the Essex County Prosecutor's Office.

On Sunday, neighbors claimed to have seen Porter's parked in the neighborhood for hours before the slayings.

New details were released on Monday by police in support of murder charges against Porter. In an affidavit, authorities revealed that Bermudez-Rodriguez and Porter had text each other about five hours before the murders occurred.

She told him that she no longer wanted to be in a relationship, which reportedly 'upset' Porter.

Police said Bermudez-Rodriguez also told Porter that she wanted her keys to the house back. Bermudez-Rodriguez was a live-in nanny for Kimowitz, his wife, Laura, and their two children.

Au pair, Karen Bermudez-Rodriguez (left), 26, and her boss David Kimowitz, 40, were killed Saturday just hours after she broke up with her boyfriend, Joseph Porter (right), 27, who has been charged with their murders

Porter (above), 27, of Elizabeth, New Jersey, was booked on two counts of murder and weapons possession in the deaths of David Kimowitz, 40, and Porter's girlfriend, Karen Bermudez-Rodriguez, 26

Police said Bermudez-Rodriguez also told Porter that she wanted her keys to the house back. Bermudez-Rodriguez was a live-in nanny for Kimowitz's family. After his arrest, Porter reportedly admitted to using her key to 'open the door' to Kimowitz's home (pictured)

After his arrest, Porter reportedly admitted to using her key to 'open the door' to Kimowitz's home.

'Porter then went to the second-floor bedroom where he proceeded to pick up a knife and stab David Kimowitz,' the document reads.

After stabbing Kimowitz, who is the owner of a comedy club in New York City, Porter bound Bermudez-Rodriguez's hands with tape, but she was able to free herself and run out of the home.

'Porter then went to the second-floor bedroom where he proceeded to pick up a knife and stab David Kimowitz (pictured with his wife),' the document reads

Porter allegedly chased her down the street and stabbed her multiple times in front of a neighbor's Maplewood home.

Authorities also said Porter tried to flee the US to Cancun, Mexico, with money from his mother.

A short time later, a jogger discovered Bermudez-Rodriguez dying of stab wounds on a street outside his residence.

Prosecutors in Essex County say police officers were called to the home shortly after 6am Saturday on a report of a woman being assaulted.

Upon arrival they found the injured Bermudez-Rodriguez lying in the street.

She was rushed to Beth Israel Medical Center where she was pronounced dead shortly before 7.30am, prosecutors said.

As officers were canvassing the area, Kimowitz was found in a home nearby after police followed a trail of blood to the residence.

Bermudez-Rodriguez was first stabbed in the home. Kimowitz was pronounced dead at the scene.

The 40-year-old lived at the home with his wife, Laura, and their two children. His family wasn't at the home, which the couple purchased in 2017, at the time of the killings.

Kimowitz is one of the owners of The Stand comedy club in New York City that relocated to Union Square last year.

The club is located on East 16th Street in Manhattan and has hosted big names like Dave Chappelle and Tracy Morgan.

Witnesses described being awakened by a screaming woman.

Bermudez-Rodriguez (left) arrived in the United States more than a year ago from her native Colombia. It's unclear how long she had been dating Porter (right)

Bermudez-Rodriguez came to the US to learn English, her friend said. Bermudez-Rodriguez began babysitting for Kimowitz shortly after her arrival

Kimowitz (right) is one of the owners of The Stand comedy club in New York City that relocated to Union Square last year. The club is located on East 16th Street in Manhattan and has hosted big names like Dave Chappelle and Tracy Morgan (center)

'I heard a woman screaming, "Oh my god!" over and over and over," said neighbor, Kathy Cantwell, 63.

'It was at 6am. My window was open. I didn’t see anything. Someone was screaming from the top of their lungs,' Cantwell added.

Bermudez-Rodriguez arrived in the United States more than a year ago from her native Colombia, a friend told NJ Advance Media.

She came to the US to learn English, her friend said. Bermudez-Rodriguez began babysitting for Kimowitz shortly after her arrival.

Autopsies are planned in Newark to determine the cause of death.

Prosecutors said their homicide task force and local police are investigating and asked anyone with information to call investigators.

Neighbors said they noticed a Toyota Corolla parked near the house (pictured) in recent weeks

Prosecutors said their homicide task force and local police are investigating and asked anyone with information to call investigators. Porter lived in this apartment complex in Maplewood, New Jersey

Neighbors said they noticed a Toyota Corolla parked near the house in recent weeks.

One of the neighbors, Raffy de la Torre, 18, says he didn't recognize the driver.

'I’ve seen his car for the last couple of weeks,' he told the New York Daily News.

'He was just sitting there. My friend saw him every day. I never saw her [Bermudez-Rodriguez] get into the car.'

Porter is being held at the Essex County Correctional Facility. His arraignment is scheduled for Thursday.

Prosecutors said they have not recovered the murder weapon.