Sprague Grayden (born July 21, 1980) is an American actress. She played schoolteacher Heather Lisinski in the television drama Jericho, Karen Kawalski in John Doe, first daughter Olivia Taylor in the television thriller 24, and Kristi Rey in the films Paranormal Activity 2 and 3.
Grayden was born in Manchester, Massachusetts to two schoolteachers. Sprague is her mother's maiden name. She had a younger brother, Benjamin Grayden, who died in 1999 due to injuries sustained in a fall. Grayden graduated with a degree in American Studies from Barnard College, where she was a performer of the drama department. In January 2013, she announced she had married her 24 co-star Alexis "Lex" Cassar. She gave birth to their son in September 2014. She describes herself as a science fiction geek and likes to collect Pez dispensers. Grayden endorsed Senator Bernie Sanders for President in the 2016 U.S. presidential election.