TEMPE, AZ (3TV/CBS 5)-- The Tempe police officer who shot and killed a 14-year-old boy in January has resigned.

Officer Joseph Jaen's resignation was announced Monday by the Tempe Police Department.

[WATCH: Expert weighs in on resignation of Tempe officer after killing teen]

Antonio Arce, 14, was shot by Jaen on Jan. 15 near 48th Street and Baseline Road.

[BODY CAM VIDEO: Officer involved in shooting of 14-year-old armed with replica handgun]

The officer believed the young suspect had a gun, but it turned out to be an airsoft gun. Arce was running away from the officer when Officer Jaen fired two shots.

"He ran because he was scared," said Arce's brother. "I heard witnesses saying he was screaming, 'Oh my God, oh my God!'"

Arce was taken to the hospital but was later pronounced dead.

“I know probably at least 20 men and women that were involved in shootings and I can easily say that not a single one of them has been unaffected,” said retired Tempe Police sergeant Kevin Boontjer.

Boontjer said even though there are two investigations still ongoing, there are likely two reasons he left the department now.

“The worst case could be it’s a resignation in lieu of being potentially terminated,” said Boontjer. “On the other side it could be a resignation by an officer that has basically just been traumatized by a terrible incident that he was involved in.”

In the body camera footage, we only see the moments right before and after the shots ring out.

Tempe police only showed members of the media the second part of the footage as more officers got to the scene, and as Arce was lying on the ground.

Journalists were not allowed to record what they were shown.

“It’s unusual. It’s not the norm. But they obviously had some reason for doing that that we’re not privy to,” said Boontjer.

After hearing of Jaen leaving the department, Arce’s brother Jason Gonzalez Arce sent Arizona’s Family this statement:

"His resignation has left me speechless. He knows he messed up, that's why he's choosing to resign. Justice shall be served!"

The Maricopa County Attorney is still reviewing the case. 

[ORIGINAL STORY: Tempe PD: 14-year-old boy with airsoft gun shot, killed by police]

Tempe police released the following statement Monday:

"The death of Antonio Arce has deeply affected all those involved. The Tempe Police Department again would like to offer our condolences to the Arce Family.

This afternoon, Chief Moir met with Officer Jaen and accepted his resignation, effective immediately.

The Tempe Police Department’s criminal investigation of the officer involved shooting which occurred on January 15, 2019 remains under review with the Maricopa County Attorney’s Office. The administrative investigation by the Tempe Police Department remains ongoing.

Officer Jaen’s resignation is independent from the criminal review and administrative investigation. At the conclusion of the criminal review and the administrative investigation, additional information will be available. Regardless of Officer Jaen’s resignation, the Tempe Police Department remains committed to accountability, transparency and strengthening our engagement during use of force encounters."

[RELATED: Hundreds march in memory of 14-year-old boy shot and killed by Tempe police officer]


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