PORT WASHINGTON, Wis. (CBS 58) -- We Energies announced sad news Thursday, after the deaths of two of its longest-returning peregrine falcons from suspected bird flu. 

The company says Brinn had been nesting at the Port Washington Generating Station since 2014, and her mate Beasley arrived at the nest site in 2017. 

Peregrine falcon manager Greg Septon found that Brinn had died in the Port Washington nest box, and Beasley has not been located. We Energies says he stopped returning to the site within a few days of Brinn's death. They say both are believed to have died from avian influenza.

“We know our customers have come to know and love Brinn and Beasley over the past 11 years thanks to our webcams,” Mike Grisar, team leader environmental for We Energies. “While we are heartbroken over their loss, we know their legacy lives on in the dozens of chicks they brought into this world and the awareness they helped to bring to peregrine falcon recovery efforts across the state.”

Brinn was born in Split Rock State Park in Minnesota in 2012. Over 11 years, We Energies says Brinn raised 30 chicks. Beasley was Brinn's mate for eight of those years and fathered 22 chicks. He was born in 2014 at the former We Energies Milwaukee County Power Plant in Wauwatosa. 

To date, 453 peregrine falcons have hatched at We Energies and WPS facilities.