Boston man serving prison sentence pleads guilty to disinterring body of missing woman
BOSTON, June 11, 2026 – A Suffolk Superior court judge today sentenced a Boston man currently serving a sentence for drugging for sex and rape to up to three years in prison after he pleaded guilty to disinterring a body in a separate case, Suffolk District Attorney Kevin Hayden announced.
RINNYERS PENA, 47, pleaded guilty to one count of disinterring a human body in connection to the death of 38-year-old Alenny Matos in 2020.
Judge Mary Ames sentenced Pena to three years in state prison, to be served concurrently with the 17-20-year prison sentence Pena is currently serving.
On January 25, 2020, Matos made plans to visit her sister. When Matos did not arrive or contact her sister for over 24 hours, her sister contacted Boston police and requested a well-being check. Police learned that Matos’ son also had not heard from his mother. Police launched a missing persons investigation on January 27.
Through cell site location data, call records, timing advance data, video footage and an interview with Pena, investigators learned that Pena made plans to pick up Matos at her home and bring her to his home on January 26. Pena called Matos’ phone at 12:36 a.m. and 12:55 a.m. During the first call, Pena’s phone was in proximity of his home and during the second call, his phone was closer to Matos’ home. At 1:13 a.m., Pena’s phone was within proximity to Matos’ home and at that time, Matos called Pena’s phone. That was the last call that Matos’ phone made an outgoing call. At about 1:18 a.m., Pena’s work truck is observed on video driving onto his street returning to his home.
For the next 14 hours Pena’s phone remained within proximity of his home. Between 1:54 a.m. and 5:46 a.m., Matos’ phone received 11 incoming calls. Each of the calls hit off the same cell tower closest to Pena’s home. None of the calls were answered and the last time that Matos’ phone hits off any tower was 5:46 a.m.
The next night, between 2:15 a.m. and 2:17 a.m., Pena’s phone is within proximity of Enneking Parkway.
On May 9, 2020, a woman walking her dog observed a body inside of a trash bag about 20 feet from the Enneking Parkway in Hyde Park. Boston Police and Massachusetts State Police (MSP) responded. The victim and bag were recovered from the swampy area and transported to the medical examiner's office. Due to advanced stages of decomposition, identification was made via dental records. The remains were significantly affected by animal activity.
Postmortem toxicology indicated positive for fentanyl, acetyl fentanyl and mercury.
Further review of the various cell phone data showed that three hours after Pena’s phone was at the Enneking Parkway, it called a tow truck. At 6:15 a.m., Pena’s work truck was observed on video on the back of a tow bed turning onto his street. The footage showed Pena remove a bin from the work truck and roll it down the sidewalk. The bin appeared to not be heavy as Pena seemed to roll it without much effort.
Massachusetts State Police using a human remains detection dog executed a search on Pena’s truck. The dog, K9 Clardy, alerted to the interior jump door behind the driver's seat.
Matos’ family delivered emotional impact statements today. Her youngest sister said: “Yeah, it hurts me, it hurts my family, but the person who this hurts the most is her son, who is left without a mom. This has impacted all of us.” She went on to say: “I have a lot of siblings but Alenny, she was my everything.”
Matos’ mother also delivered an impact statement.
"As we heard so clearly in the victim impact statements today, Alenny Matos was a much-loved mother, sister and daughter. Her death—especially combined with the callous disposal of her body by Rinnyers Pena—has given her family and all of those who knew and loved her eternal grief and sadness," Hayden said.
On May 15, Pena was found guilty of one count of drugging for sexual intercourse, one count of strangulation, two counts of rape, and two counts of photographing an unsuspecting nude person. Pena was sentenced the following week to 17-20 years in state prison with five years of probation to follow including GPS monitoring and sex offender registration.
All charged individuals are presumed innocent until and unless proven guilty beyond a reasonable doubt.
Suffolk County District Attorney Kevin Hayden’s office serves the communities of Boston, Chelsea, Revere, and Winthrop. Our office handles more than 20,000 cases a year. Nearly 160 assistant district attorneys practice in nine district and municipal courts, Suffolk Superior Court, the Massachusetts Appeals Court, the Boston and Chelsea Juvenile Courts and the Supreme Judicial Court. Our office employs some 300 people and offers a wide range of services and programs for anyone encountering the criminal justice system. We are committed to educating the public about our mission and services while focusing on crime prevention to keep the residents, workers and visitors of Suffolk County safe.
James Borghesani, Chief of Communications