Boston school officials say they will provide "a full accounting of what happened" after a school bus driver reportedly struck and killed a kindergartener last month.

Lens Arthur Joseph, a student at UP Academy Dorchester, was killed after stepping off a Boston Public School bus on April 28, according to the district. The driver, Jean Charles, was employed by district bus contractor Transdev since May 2023.

The Suffolk County District Attorney's Office and Boston Police Department are investigating the death.

"We mourn the death of Lens Joseph and grieve with his family at this terrible time," a school district spokesperson said in a two-page fact sheet that confirmed some details of the tragic incident previously reported by the Boston Globe — including the fact that Charles was driving with an expired school bus certificate.

The incident occurred at 2:43 p.m. at 107 Washington Street in Hyde Park, according to a Boston police report obtained by WBUR. The Globe reports that the collision happened shortly after Charles struck two parked cars in Mattapan. He reportedly tried to flee after striking the child but was blocked in by another driver, the Globe reported, adding that Charles was new to the route and initially missed a turn.

A district spokeswoman declined to confirm or address any of those details Thursday.

The report filed after the crash indicated Charles is not suspected of any drug or alcohol use, nor is he suspected of using his phone or a handheld device.

He was placed on immediate leave by Transdev and resigned his post before a scheduled due process hearing on May 14, according to information shared by the district.

Meanwhile, Boston city officials on May 15 called for more transparency into the investigation.

“We have to fully investigate what happened and make sure that this never happens again to any child in the city," Boston City Councillor Erin Murphy told WBUR on Thursday. “It's just an unnecessary tragedy."

Murphy said the fact the driver was driving with an expired certificate points to “alarming failures in oversight and accountability within our system.”

“Do we need real time licensing monitoring?” she said.

Both Murphy and City Councillor Ed Flynn have called for a review of the district's school bus driver hiring and monitoring policies.

“This troubling development warrants an immediate review of the certification and safety records of every BPS bus driver,” Flynn said in a statement.

A spokesman for the Suffolk County District Attorney's Office did not provide any additional comment on Thursday.

In its statement Thursday, district officials said Transdev is responsible for hiring and training bus drivers and is supposed to ensure drivers are up to date with required certification. The statement added that Transdev notified the district about Charles' lapsed school bus certification only after the crash took place.

Officials with Transdev, a France-based company that operates in multiple countries and U.S. states, declined to provide additional comment beyond the information that Boston Public Schools has already shared. The company has operated the city's public school buses since 2013. It's currently working under a five-year contract signed in 2023.

Transdev employs roughly 750 active bus drivers in Boston, according to a recent transportation report.

Speaking at a May 14 School Committee meeting, Superintendent Mary Skipper asked for a moment of silence for the Joseph family.

“Anytime we have a student that's injured or loss of life, we work really directly with the families to try to support them as best we can,” she said. “That includes trying to figure out how to support social, emotional, mental health, things that the family may need most immediately.”

Funeral services for Joseph will be held on Saturday.

His family described the UP Academy Dorchester kindergartener in an obituary as “an intelligent, vibrant and funny kid” who loved planes and cars and the superhero Spiderman, and who dreamt of becoming a police officer.

The leader of UP Education Network — which operates the K-8 Dorchester charter school — said in a statement that the school community is “so saddened by the loss of one of our students.”

“Our hearts are broken for the family and words can't express how much this loss will mean to our community,” CEO Hillary Casson said in the statement. “We will do everything we can to support the family as well as the students, families and staff in our school community.”

Attorneys for the Joseph family told WBUR that they're committed to “making changes to any and all relevant policies and procedures.”

“The family has suffered an unimaginable loss,” said attorney Alan J. Klevan. “This tragedy could have been, and should have been, completely avoided.”

This story was published by WBUR on May 15. The Reporter and WBUR share content through a media partnership.