“No matter how many years go by, I will never get over his loss.”

Hayden Panettiereis mourning her younger brother.

“He was my only sibling, and it was my job to protect him, Panettiere toldPEOPLE.

Hayden Panettiere attends the world premiere of Paramount’s “Scream VI” at AMC Lincoln Square Theater on March 06, 2023 in New York City

Hayden Panettiere.Dimitrios Kambouris/Getty

“When I lost him, I felt like I lost half of my soul.”

Dimitrios Kambouris/Getty

TheHeroesstar said she does not expect her grief to subside.

“I will always be heartbroken about it.

Actress Hayden Panettiere (L) and Jansen Panettiere arrive at Variety’s 5th annual Power Of Youth event presented by The Hub at Paramount Studios on October 22, 2011 in Hollywood, California.

Hayden Panettiere and Jansen Panettiere.Frazer Harrison/WireImage

I will never be able to get over it,” she says.

“No matter how many years go by, I will never get over his loss.”

TheScreamactress said that intense media attention exacerbated her pain.

“My agoraphobia came out, which is something Ive struggled with in the past.”

Panettiere eventually began taking walks with her personal trainer, Marnie Alton.

“My body just started reacting, not just from the working out.

It allowed me to release the stress, the high expectations Id always put on myself, she said.

Panettiere will next star inAmber Alert, which hits theaters Sept. 27.