This onetime doctor sought revenge after being fired. Now he's been convicted on 4 murder charges.

"If you shall wrong us, shall we not revenge?" That's a quote from Shakespeare's "The Merchant of Venice," one police found among Anthony Garcia's Internet searches. The quote proved chillingly fitting for the 42-year-old Terre Haute, Ind., man. Feeling himself wronged, he did indeed take revenge. On Wednesday, the former doctor was convicted of murdering four people as retribution for something that happened 15 years earlier.