CNN — From triumph to tragedy
On April 15, two homemade bombs exploded at the finish line of the Boston Marathon where three people were killed and more than 260 were injured.
26-year-old Tamerlan Tsarnaev, and his 19-year-old brother Dzhokhar Tsarnaev were named as suspects. After a wild chase in the early hours of April 19, the older Tsarnaev was killed by police. The younger was found after a day-long manhunt. In July, Dzhokhar Tsarnaev plead not guilty to 30 federal charges related to the terror attacks.
A scary sight at San Francisco international airport
On July 6, Asiana flight 214 was in the final moments of a flight from Seoul, South Korea, when investigators say the pilot approached too low and too slow and crashed into a seawall. Three people were killed and 182 were injured. The Asiana pilot was in training to fly the Boeing 777. It was the first time he'd landed that kind of aircraft at the San Francisco Airport.
One week later in a Florida courtroom
On July 13, former neighborhood watch captain George Zimmerman was acquitted of murder charges in the February 202 shooting of 17-year-old Trayvon Martin. Zimmerman's attorneys called the shooting self-defense while Martin's family called it racial profiling. The state of Florida called it murder, but after 16 hours of deliberation, the all-female jury would not agree.
A rampage at a United States Navy facility
On September 16, military contractor Aaron Alexis entered building 197 at Washington's Navy Yard, as seen in the surveillance video. After ducking into a bathroom and emerging with a shotgun, Alexis shot for 30 minutes before police found and killed him. 12 others were killed in the attack. The investigation uncovered a number of red flags about Alexis. In the weeks prior to the attacks, he'd complained of hearing voices, and of trouble sleeping. The FBI described his state at the time of the shooting, as "delusional."
Kickoff of enrollment in health insurance exchanges under the president's affordable care act did not go as planned
The enrollment website, plagued with problems, brought the Obama administration under fire. Republican lawmakers demanded answers about who knew what, and when. The administration set a deadline of November 30 to resolve the website issues.