5 Things to Know This Morning

April 30, 2013— -- Your look at the five biggest and most buzz-worthy stories of the morning.

1. NBA's Jason Collins Comes Out as First Openly Gay Pro Athlete
Jason Collins says it's "mind-boggling" to be first openly gay pro athlete. See Collins' exclusive interview with ABC News' George Stephanopoulos today on "Good Morning America."

2. Large Explosion Rocks Syrian Capital
A powerful explosion rocked Damascus, the capital of Syria, this morning. Residents say they heard a blast and saw black smoke billowing from behind buildings.

3. New King of Netherlands
Willem-Alexander becomes king of the Netherlands as his mother Beatrix abdicates after 33 years. Her son is the country's first king since 1890.

4. Bangladesh Building Collapse Death Toll Expected to Rise
The death toll in the Bangladesh building collapse is expected to rise today. One estimate said as many as 1,300 may be found dead in the rubble as emergency workers dig toward the ground floor.

5. Boston Bombing Suspect's Legal Team Gets a Boost
Judy Clark is joining the team that will represent Boston bombing suspect Dzhokhar Tsarnaev. Clark is a prominent death penalty lawyer. Her past clients include the Unabomber, Ted Kaczynski; Susan Smith, who drowned her two children; and most recently Tucson, Ariz., shooter Jared Loughner.