After a 24-hour manhunt that paralyzed the Boston area, authorities captured the suspect in this week's marathon bombings. In the aftermath, his older brother -- also a suspect -- lay dead, and so did a police officer believed killed by the two.
A quick glance at the five major developments.
The teen bombing suspect suffered serious injuries and is hospitalized at Beth Israel Deaconess Medical Center, a hospital spokesman said.
The standoff and subsequent arrest Friday night came just minutes after frustrated authorities indicated during a news conference that a manhunt for the suspect came up empty.
HOW IT STARTED
Police responded Thursday night to a call on the Massachusetts Institute of Technology campus, where university police officer Sean Collier, 26, was fatally shot. Police believe the Boston Marathon bombing suspects, Dzhokar and Tamerlan Tsarnaev, were responsible for the shooting.
Soon after the alleged attack, the two suspects hijacked a car at gunpoint in Cambridge, taking the driver hostage. They later released the hostage at a gas station, and as a police chase ensued, the suspects hurled a grenade and pipe bombs at officers in hot pursuit.
A NIGHT OF MAYHEM
Authorities used the tracking device in the carjacked Mercedes to track the brothers to Watertown.
However, the suspects were determined not to go down without a fight. Explosives and gunfire rang into the night, sending residents scattering.
Officers fired back, striking a man later identified as Tamerlan Tsarnaev, 26.
He was suspect No. 1 in the Boston Marathon bombings that killed three people and injured about 180 others.
He was wearing explosives when his body was recovered, a source said.
The younger brother -- suspect No. 2 -- fled into the night.
Authorities asked Boston-area residents not to leave their homes Friday as they went door-to-door searching for the suspect. They shut down transportation services and asked residents to stay home as a massive manhunt ensued.
About 6 p.m., a frustrated Gov. Deval Patrick lifted the lockdown and said mass transit service has resumed. He urged residents to be vigilant because the suspect was still on the run.
Not too long after the lockdown was lifted, there was some good news.
Massachusetts authorities arrested the teen after a resident found him in his boat in Watertown. The man saw blood on his boat in the backyard, and the suspect bleeding under a tarp.
Police converged on the scene and asked the teen to surrender.
"Come out on your own terms. We know you're in there. Come out with your hands up," officers said.
Police and the suspect exchanged gunfire.
He was found in a boat in the yard of a home close to where he and his older brother engaged in a shootout with police nearly 24 hours earlier.
"We've closed an important chapter in this tragedy," President Barack Obama said after the arrest.
2 BROTHERS, 2 ENDINGS
The brothers came from the Russian Caucasus region and moved to Kazakhstan at a young age before coming to the United States several years ago. The younger brother was 8 years old at the time, according to relatives. He came to the United States as a tourist with his family in the early 2000s and later asked for asylum. He became a naturalized U.S. citizen last year, according to a federal official.
He attended the University of Massachusetts-Dartmouth.
The older brother was not a citizen, but was lawfully in the United States as a green-card holder. He studied engineering at Bunker Hill Community College just outside Boston, but had taken the year off to train as a boxer, sources told CNN.
The family of Katherine Russell, his wife, issued a letter saying their "hearts are sickened by the knowledge of the horror he has inflicted."
FBI agents interviewed the older brother two years ago at the request of a foreign government, but found no connection with terror groups. An agency official declined to to name the foreign government, but said the FBI took various investigative steps, including looking at his travel history and checking databases for derogatory information.