BRIDGEPORT — It took two years for Bridgeport police to charge Derrick Siberon with the 2015 sexual assault of an 8-year-old girl.

The charge came shortly after he was suspected of killing his 10-month-old son.

On Thursday, he pleaded guilty to first-degree manslaughter for the baby’s death — roughly five months after pleading guilty to the sexual assault. The plea was part of a deal that will result in a 15-year sentence — followed by 20 years of probation — for Siberon, 32, for both charges when he is sentenced on May 8.

He will also have to register as a sex offender for life. Senior Assistant State’s Attorney Colleen Zingaro told the judge the mother of the dead child was in agreement with the disposition.

Siberon had faced a maximum sentence of 20 years for the manslaughter charge and 25 years for the sexual assault.

The sentencing will end a sexual assault investigation that began with a rape kit taken in April 2015 but until April 2017.

The rape kit was sent to the state police lab for DNA processing just days after police began investigating Siberon for his son’s death.

Siberon’s case was the first of three cases that brought to light problems at the police’s Youth Bureau in investigating serious felony cases involving children.

Police Chief Armando Perez in 2018 dissolved the Youth Bureau and retired its head, citing the bureau’s decades of mishandling cases against minors. At the time, he pointed out the unit’s failure to find out what happened to 10-year-old Bianca Lebron, who disappeared in front of her school on Nov. 7, 2001, and was never found.

“Detectives and supervisors of the Special Victims Unit uncovered several cases dating back to 2013 that were a part of the original Youth Bureau files,” Police Department Spokesman Scott Appleby confirmed. “These cases were reviewed, and when necessary re-investigated, and evidence was sent to the state laboratory when appropriate. If probable cause existed to charge, a warrant was applied for.”

Detective Thomas Harper, in an affidavit, noted that the investigation into the 2015 sexual assault of the 8-year-old resumed shortly after Siberon was investigated for his son’s death.

“Derrick’s whereabouts were now known and I resumed the investigation of this case,” Harper states in the affidavit.

On April 26, 2015, the girl’s mother and her boyfriend came to the Police Department to complain that her daughter had been sexually assaulted by Siberon. Police said the boyfriend told officers of Siberon, “You better find him before I do.”

The girl was taken to St. Vincent’s Medical Center where a rape kit collected DNA from the child, the affidavit states. The kit was submitted as evidence to the Police Department property room.

The child’s 五福彩票注册送15元 and room were photographed by detectives and evidence was collected including Siberon’s belongings and identification card.

The affidavit states that the girl told a doctor at the hospital that Siberon had sexually assaulted her in her bedroom and that statement was included in a report to the state Department of Children and Families.

On April 29, 2015, the girl gave a detailed description of the alleged sexual assault by Siberon during a forensic interview at the Center for Family Justice including using anatomical drawings to illustrate what she said happened to her, the affidavit states.

Nothing more was done in the case until April 26, 2017, when Harper sent the rape kit to the state lab.

At that time, the affidavit states that Siberon was under investigation in his son’s death two days before. Siberon, who voluntarily went to the police department, admitted being in the girl’s 五福彩票注册送15元 but denied sexually assaulting her, according to the affidavit.

On May 25, 2017, Siberon was charged with first-degree manslaughter and risk of injury to a minor in connection with the death of his son, who died as a result of head injuries, according to the autopsy report.

On Dec. 22, 2017, the affidavit states the state police lab identified Siberon’s DNA in the rape kit taken from the girl. He was arrested two months later.

Siberon later pleaded guilty under the Alford Doctrine to first-degree sexual assault, as the victim was about to testify at his trial.

A plea made under the Alford Doctrine means Siberon did not admit his guilt but concedes he could be found guilty if he went to trial. The judge then found him guilty.