DARIEN — Three Darien police officers will be moving up the ranks.

The Darien Police Commission announced the promotion of the officers on March 17, with the new positions taking effect two days later.

“I’m very pleased all three people are promoted, and I’m looking forward to working closely with them as supervisor,” said Police Chief Ray Osborne.

In wake of the promotion of Osborne to chief, Lt. John P. Lawlor has been promoted to serve as the department’s second captain. Previously a supervisor in the patrol and training divisions, he will be in charge of the field services bureau.

“I’ve worked with Capt. Lawlor for 30 years,” Osborne said. “He’s highly skilled and highly competent. He’s taking over my old job, and I’m very happy I’m working more closely with him.”

Lawlor has served on the force for 31 years. During his tenure in Darien, Lawlor instituted the department’s crisis intervention team and the Project Lifesaver program, designed to bring home people who are at risk of wandering away from their houses. Lawlor is a member of the School Safety Committee, the SCUBA team and the Southwest Regional Emergency Response Team.

A licensed clinical social worker, Lawlor volunteers in the marriage ministry at his church.

The commission also singled out Sgt. Jeremiah P. Marron Jr., a Darien police officer for 21 years. The newly promoted lieutenant will be assigned to the patrol division.

“Lt. Marron has done an excellent job,” Osborne said. “He’s been the detective bureau sergeant for the past three years and is going to move back into patrol, which he’s going to bring wealth of experience to. I expect great things from him.”

Marron made sergeant in 2006 and was assigned to the patrol division. For the past three years, he served as a supervisor in the detective division. He also supervises the selective enforcement unit, the K-9 unit and the accident investigation team. He is the department’s public information officer and a member of the SCUBA team, working as a rescue diver.

For nine years, Marron served on the Southwest Regional Emergency Response Team. He was also a field training officer for six years.

In 2016, he received the United States Attorney’s Award.

The commission also promoted Detective Nicholas S. Aranzullo to sergeant. He will be assigned to the patrol division, and has been with the department for 12 years.

“Sgt. Aranzullo is another excellent officer,” Osborne said. “He was our K-9 officer for a number of years and is someone with a lot of experience. I look forward to great things from him. He’s highly skilled and highly competent.”

In 2008, Aranzullo and Marron helped form the department’s first K-9 unit, and the following year, Aranzullo was selected to be the department’s first K-9 handler. Aranzullo and his partner, K-9 Zulu, worked in the patrol division and received multiple awards and commendations. When Zulu retired in October, Aranzullo was reassigned to the detective division.

The three officers will be promoted officially in a ceremony on April 5 at 6 p.m. at the Darien Community Association House on Middlesex Road. Three new officers will be sworn in at that time as well.

ekayata@hearstmediact.com; @erin_kayata