Her representatives shared the news of her demise, reports variety.com.
Porter, who also appeared in "Twin Peaks: The Return", "Mercy", "American Horror Story", "The Suite Life on Deck", "Gilmore Girls" and other series dating back to the late 1980s, most recently played Myrtle on "Superstore".
She appeared in 35 episodes as a store employee in the comedy show.
"Superstore" executive producers Jonathan Green and Gabe Miller mourned the loss.
"Linda wasn't just hilarious, she was incredibly sweet, energetic and enthusiastic working with her brightened everyone's day. We're lucky to have been a small part of her long career. The 'Superstore' family won't be the same without her," they said.
"Superstore" actor Ben Feldman also shared his condolences.
"Here's hoping the angels don't call cut right away because your best stuff always came at the end. We'll miss you Linda Porter," he wrote on Twitter and Instagram.
Her "Superstore" colleagues, including actors Mark McKinney and Danny Gura, writer Vanessa Ramos and consulting producer Owen Ellickson, also offered tributes to the actress.
"Thank you for the life advice," wrote McKinney.
"We lost a good one," tweeted Gura, adding: "R.I.P. Linda Porter, who was always smiling and always brightened up the Superstore set. This is a hard one. You will be missed."
Ramos wrote: "RIP Linda Porter. A true delight of a person who was up for anything."
Ellickson also shared: "RIP Linda Porter, a wonderful actress and a lovely person."
( With inputs from IANS )