Armstrong, who co-founded the rock band, Dead Sara, made her Linkin Park debut in a live performance earlier this month alongside new drummer Colin Brittain.
Armstrong is already known for her vocals with LA rock band Dead Sara, while Brittain is a renowned songwriter and producer who has worked with the likes of Aussie musician G Flip.
He claimed Linkin Park co-founder Mike Shinoda had “quietly erased my father’s life and legacy in real time … during international Suicide Prevention Month”.
He went on to allege that the band had “failed to address the concerns of their diverse fan base” and that the music group’s recent actions “are not something people should acclimate to”.
“You have betrayed the trust loaned to you by decades of fans and supporting human beings including myself,” he continued.
“We trusted you to be the bigger better person. To be the change. Because you promised us that was your intention. Now you’re just senile and tone deaf. Insane.”
Although Shinoda has not publicly addressed Jaime’s criticisms, Armstrong has spoken out against the claims she still supports Masterson.
“Several years ago, I was asked to support someone I considered a friend at a court appearance, and went to one early hearing as an observer,” she wrote on her Instagram story on September 7.
“Soon after, I realised I shouldn’t have. I always try to see the good in people, and I misjudged him. I have never spoken with him since.”
Fans of the band have also questioned Armstrong due to her links to the controversial Church of Scientology.
Meanwhile, the group will be embarking on a six-date From Zero World Tour in support of their upcoming album of the same name, kicking off in Los Angeles on September 11, before hitting New York, London, Germany, South Korea and Colombia.
The album will be their first since One More Light, which they released in May 2017, two months before Bennington’s death on July 20.
At the time, the band were about to embark on an extensive North American tour with Blink 182, with the first concerts scheduled for July 27 that year.
Bennington was found dead inside his home one week before the tour was due to start, reportedly taking his own life. Needless to say, the tour was cancelled.