MILWAUKEE COUNTY, Wis. (CBS 58) -- The Milwaukee County Zoo on Thursday announced the death of 19-year-old Stella, their female jaguar. 

The zoo says Stella was humanely euthanized due to ongoing chronic health problems that were not improving. 

Zookeepers say Stella was well-known and the "matriarch" of Big Cat Country. 

She was brought to the Milwaukee County Zoo in 2005 from the Fort Worth Zoo and had two litters with male jaguar, Pat -- two male cubs in 2012 and a male and female cub in 2014, according to the zoo.

In a post shared on social media Thursday, the zoo said Stella will be "deeply missed."