November 02, 2015 06:30 PM

The remains of a Connecticut couple who were reported missing Aug. 7 were found on Thursday and their 27-year-old son was subsequently charged with their murders.

Kyle Navin, 27, has been in jail since September after he was indicted for one count of possession of a firearm by an individual who is an unlawful user of and addicted to a controlled substance. He pleaded not guilty to those charges, according to The New York Times.

On Friday, he was charged with two counts of murder.

His girlfriend, Jennifer Valiante, 31, has been charged with conspiracy to commit murder and hindering prosecution.

The remains of Jeanette and Jeffrey Navin, of Easton, Connecticut, were found in the nearby town of Weston, Weston police chief John Troxell confirms to PEOPLE. The last time anyone heard from either of the two was on Aug. 4, according to an affidavit obtained by PEOPLE.

Prior to that, Jeffrey had texted his son, “Did you hurt mom?” according to the affidavit.

Kyle responded: “No absolutely not. Why would you think.”

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Kyle gave police several different versions of the last time he spoke with or saw his parents, both in terms of the content and location of the conversation, the affidavit states. But cell site activity on Jeffrey and Jeanette’s cell phone, along with text messages exchanged between them and Kyle, did not match up with Kyle’s statements.

Texts: ‘Get Money For Life. … It’s [a] Perfect Plan’

According to the affidavit, the cell phones of both Navin and his girlfriend, Jennifer Valiante, were seized under a search and seizure warrant.

Numerous deleted text messages between them were revealed:

Navin sent a message in May to Valiante, about his plans to “take them down,” and “get some money out of them somehow.”

They would then have “hundreds of thousands to buy … you a new car and enjoy life taking vacations, having fun with friends no stress no contact ever aging with the bad people,” he wrote her in July.

That same day, he sent her another text message about his plan to “solve every single problem and give us a wealthy amazing life.”

He had “been thinking about this since nonstop since yesterday,” he said, before addressing Valiante: “Think about it little one.”

Kyle Navin

“I hear ya. It sounds very good I just don t know,” she replied, according to the affidavit.

Shortly after, Navin wrote, “Wipe out the infection and get $ for life. … It’s [a] perfect plan.”

A Dark Past

While investigating the disappearance of Jeanette and Jeffrey in August, investigators allegedly discovered guns and drugs in Kyle’s residence .

According to a press release, authorities seized two firearms and numerous rounds of ammunition from his Bridgeport home on Aug. 13. On Aug. 19, they also seized “items indicative of substance abuse” like baggies with heroin residue, hypodermic needles, and empty prescription bottles for oxycodone.

On Sep. 29, according to the affidavit, investigators spoke with Navin’s younger brother, Taylor Navin, who resides in Mississippi.

Taylor said that the relationship between his brother and parents was “not good at all,” and that their relationship as “always been like that,” the affidavit states.

When he was informed that his brother was a person of interest in the disappearance of their parents, he said, “When I heard that my parents were missing I thought to myself…they either went on vacation, or my brother did something to them,” the affidavit states.

Western District Major Crime detectives also allegedly discovered two bullet holes in the front passenger seat of Navin’s blue 2000 Chevrolet on Aug. 14. Further investigation revealed that there was bloodline transfer on the front leading edge of the driver’s seat and that it matched his mother’s DNA profile.

During a search of Navin’s home the day before, detectives found receipts from Home Depot dated Aug. 5, where he purchased Clorox, drain cleaner, Simple Green, bug spray, Goo Gone, Tough Tape, dryer sheets, and heavy duty black contractor trash bags, the affidavit states.

A lawyer for Valiante said Monday that his client was not involved in plotting or carrying out the murder of her boyfriend’s parents, according to The Hartford Courant. She is being held on $2 million bond.

Navin has yet to enter a plea for the two murder charges.

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