"The Mentalist" season 6 penultimate episode airs this Sunday - find out where to watch online a free live stream of "The Mentalist" season 6, episode 21. Will Lisbon move to Washington DC with Agent Pike?

If you can't make it to a TV by 10pm EST Sunday night to catch "The Mentalist" season 6 penultimate episode, click here to watch the last episode of the series online via a free live stream!

If that doesn't work, CBS also offers episodes on their website to watch online the morning after an episode airs.

The synopsis for "The Mentalist" season 6, episode 21 titled "Black Hearts" reads: "The head of a kidnapping ring is sought by Jane and Lisbon as the victims begin to run out of time. Meanwhile, Lisbon makes her decision about whether to move to Washington, D.C., with Agent Pike."

Will Lisbon make the big decision? Find out by tuning into "The Mentalist" season 6, episode 21 Sunday night, May 11 at 10pm on CBS.

And stay tuned for next week's "The Mentalist" season 6 finale!