The victim's girlfriend identified the good Samaritan as Thierry Bastien, 41, a new dad who was killed while rushing to a woman's aid in a Florida Walmart, she said.

A man pulled a gun during a dispute with another customer in Walmart checkout lines near Philadelphia and opened fire, wounding several people before fleeing but was later arrested after crashing into a police vehicle, police said Tuesday night.

2015 was a year filled with incredible moments caught on video. From the shocking to the inspiring, here's a look back at the most memorable videos of the year.