He was booked into the Fresno County Jail on two counts of murder, two counts of arson, a count of possession of assault weapons and a count of vandalism. DuPras' bail is set at $3.142 million.
After nearly a year-long investigation the man accused of killing a Kingsburg principal and her mother is in jail.
The Fresno County Sheriff's office announced the arrest of 58-year-old Alan DuPras.
He is suspected of killing his estranged wife Jennifer DuPras and his mother-in-law Cynthia Houk.
Friends of Jennifer were not surprised he was the prime suspect.
"Many many instances where she was worried about him following her or she was worried about him coming to her house," said L'Alliance Francaise de Fresno Nidia Innis-Gonzalez.
Nidia Innis Gonzalez is relieved justice may soon be served for her best friend Jennifer Dupras.
The two quickly bonded as members of L'Alliance Francaise de Fresno where Dupras served as director of classes and president.
"She was in my words an angel she was truly a person of heart down to earth," said Innis-Gonzalez.
Nidia says after Jennifer filed for divorce in October of 2017 she became frightened of her estranged husband Alan.
"She always said I don't want to do anything to upset him. He will be upset and he has guns," said Innis-Gonzalez.
It was December 11th when Fresno County Sheriff's deputies found Jennifer and her mother, Cynthia Houk shot to death inside their northwest Fresno Home.
Throughout the last nine months, detectives were able to connect Dupras to the murders as well as a pair of arson investigations.
One involved Houk's car intentionally set on fire. The other was on December 4th-- where L'Alliance Francaise de Fresno was destroyed by arson.
Nidia says they were supposed to be there the night of the fire but their class was moved to a different location.
Surveillance video for the night of the fire shows a pickup truck matching Alan Dupras' 2017 Chevy Colorado.
"As a result of search warrants we were able to pull that together to show he was responsible for both," said Sheriff Margaret Mims.
Though his attorney Mark Broughton says DuPras maintains his innocence. Sheriff Margaret Mims says she is confident in her detectives adding technology will play a key role in the case.
"It gives us another tool to use to be able to identify people places locations conversations that in the past we have not been able to," said Mims.