The trial of a man charged with the murders of his infant daughter and her mother began this week, with prosecutors revealing chilling new allegations in a case that has captured national interest.

Brandon Isabelle, 28, stands charged with first-degree murder, aggravated child abuse or neglect, and aggravated kidnapping in the deaths of 27-year-old Danielle Hoyle and their newborn child, Kennedy Hoyle. The slayings were premeditated, prosecutors argued on Tuesday, saying Isabelle constructed a plan so that his kid and “baby mama” would be out of the picture.

He has pleaded not guilty.

It all began on Jan. 30, 2022, when Isabelle received word that Hoyle was in labor. He is said to have gone to the hospital and stayed with her, but all the while, he was texting with another woman.

Isabelle and Hoyle had met at FedEx, where they both worked, state prosecutor Amanda Carpenter said in her opening statement. But after a brief sexual relationship resulting in Hoyle getting pregnant, Isabelle met someone new — and according to prosecutors, he would “do anything” to be with her.

This new woman, who also worked at FedEx, “didn”t want to deal with another child or another baby mama in the mix,” according to Carpenter. As Isabelle sat in the hospital texting the new woman, she was “talking about ending things, breaking up,” while he was trying to convince her to keep giving the relationship a chance.

“In the midst of these text messages in the wee hours of January, 31, 2022, baby Kennedy Hoyle was born,” Carpenter continued. Isabelle is said to have left the hospital later that morning and met his new girlfriend at a small Memphis peninsula called Mud Island. They reportedly continued to discuss what they wanted, but “nothing was resolved.”

Hoyle and Kennedy were released from the hospital the following day — Feb. 1, 2022 — and they returned home to meet their family, according to authorities. Then Hoyle received word from Isabelle.

Left: Kennedy Hoyle (Memphis Police Department/Tennessee Bureau of Investigation). Right: Brandon Isabelle (Shelby County (Tenn.) Sheriff’s Office).

He said he wanted to give their baby clothes, prosecutors recalled, and so they agreed to meet at a Mapco convenience store in the city, with Kennedy in the backseat of her mother’s car.

But Isabelle allegedly had other plans.

He “convinced” her to come down another road — one that was “desolate, deserted, [and] dark” — and as she parked her car, he approached, opened the passenger side door, “and fired five shots into Danielle’s car, striking her in the face and the head,” Carpenter stated. He then reportedly “dragged” her body and left her “face down in a ditch so dark that all that could be seen were Danielle’s bright pink shoes.”

Isabelle then took his daughter in her car seat, put her in his own car, and drove away, “leaving Danielle face down, blood gushing from her head in the muddy rain water,” Carpenter added. He is said to have spent time driving around before going back to his parents’ home, where he lived, and changing his clothes, all while leaving Kennedy — who was not yet even 2 days old — alone in the car.

“He had one more problem to take care of,” Carpenter flatly told the courtroom. He got back in his car, and drove back to Mud Island, an action reportedly captured by “real-time” law enforcement cameras, and stopped at the “old boat ramp” where the mouths of the Wolf and Mississippi rivers meet.

“He took Kennedy from her car seat, grabbed her by the leg, and threw her into the cold, dark water, not realizing that her little baby cap had fallen from her head and lay resting on the river bank,” Carpenter said.

Isabelle is said to have returned home and continued texting his new girlfriend, then traveling to Walgreens to buy gifts for her. He also reportedly sent messages to Hoyle, “knowing that she’ll never answer.” He also drove to a nearby Walmart and dumped the car seat there, which was later found by a “Good Samaritan,” prosecutors say.

At this time, then-Memphis police officer Cody Sutton was on a routine patrol in the area where Hoyle was killed. He saw a car parked on the wrong side of the road and ran the license plate in law enforcement’s database, finding her address and heading there, suspecting a stolen vehicle.

When he got there, he learned Hoyle was missing, and he started “to realize the gravity” of the situation. According to police, he went back to the scene where he saw the car, and he made “the gruesome discovery of Danielle’s body.” However, he found no baby or car seat.

As police officials continued the initial stages of their investigation, Isabelle reportedly rushed to meet his girlfriend at her residence and immediately told her they needed to leave. Soon after, they were detained by Memphis police officers, who questioned Isabelle before rushing to Mud Island and beginning a “frantic search.”

Kennedy’s body was not found. However, according to authorities, when officers searched Isabelle, they found blood on his socks that ended up matching Hoyle’s. Furthermore, as Law&Crime previously reported, the apparently told officers he threw the gun he used to kill Hoyle into the river as well.

Records also showed that Feb. 1 is Isabelle’s birthday, indicating he allegedly murdered two people on his 25th birthday.

“Ladies and gentlemen, once you’ve heard all the proof in this case, the witness accounts, the DNA, the video, once you’ve heard all the evidence, the state will ask that you find the defendant guilty of each and every count,” Carpenter said, concluding her opening statements.

Isabelle’s defense attorney was terse when he had the chance to speak, saying, “The burden is on them to prove these allegations, prove these allegations beyond a reasonable doubt.”

Hoyle’s mother said shortly after the killings that Isabelle’s alleged behavior “was not a mistake.”

“I want him to suffer like he made my baby suffer,” Campbell said per Memphis NBC affiliate WMC. “I want him to hurt. I don’t want it to be easy for him. I want him to suffer. He needs to suffer. Why would you hurt a baby?”

The trial is continuing on Wednesday.