Lady Justice and the Broken Hearts

Walt goes under the knife for a heart operation and while in the hospital, stumbles upon a series of mysterious deaths that are certainly not from natural causes.
He solves that mystery only to discover that people on the transplant waiting list are suddenly dying as well.
Then, information about a terrorist plot is found on a heart attack victim who has been rushed to the ICU.
Throughout it all, Walt discovers that there are many ways that a person may die of a broken heart.