IRS said it delivered some 130 million payments worth about $335 billion, with more to come in later days and weeks. Source

A GoPro camera placed in a Gibbon ape habitat at Fort Worth, Texas, gives us some adorable images. CBSN’s Elaine Quijano and Vladimir Duthiers take a look at the cuddly creatures. Source

Officer William “Billy” Evans, an 18-year veteran of the Capitol Police force, was killed when a man drove a car into a street barricade in Washington D.C. Source

Pop star Elton John appeared before a Senate panel on global health issues. CBSN’s Vladimir Duthiers and Elaine Quijano have key moments from his testimony. Source

The singer and songwriter has always been a musical outlaw. He was inspired by blues, jazz, gospel, honky tonk and the ’60s hippy movement, and he created a sound all of his own and revolutionized country music. Willie joins “CBS This Morning” to discuss his new memoir, “It’s a Long Story.” Source

The red carpet for the Metropolitan Museum of Art’s annual fundraiser attracted the hottest celebrities and trendiest fashions. Vladimir Duthiers reports on why tickets to the event was so coveted. Source

Boston Marathon bomber Dzhokhar Tsarnaev became emotional for the first time during his two-month trial. The 21-year-old cried in court Monday, as relatives took the witness stand in an effort to save his life. Don Dahler reports. Source

The terror group is now claiming responsibility for an attack on a Texas art exhibit and contest featuring drawings of the Prophet Muhammad. The terror group’s official radio station made that claim this morning. One of the two gunmen killed by police Sunday in Garland, Texas, had longstanding ties to an alleged jihadi group in Phoenix. The other suspect, Nadir Soofi, apparently had no criminal record. Soofi’s mother says she can’t imagine what went through her son’s mind. Omar Villafranca reports. Source

Australian singer Cody Simpson tells CBS News’ Lauren Moraski why he’s going the independent route with his new album “Free” and what advice John Mayer gave him. Source

Singer Cody Simpson tells CBS News’ Lauren Moraski about teaming with Miley Cyrus for his new album, “Free.” Source