Timeline: How the relationship between Farook and Marquez developed

Here is a timeline of the relationship between two key figures in the San Bernardino terrorist attack, as alleged in a federal criminal complaint:

2004: Enrique Marquez moves from El Monte to Riverside, next door to Syed Rizwan Farook.

2007: Under Farook’s influence, Marquez converts to Islam and is later introduced to radical ideology.

2011: Farook and Marquez begin plotting terrorist attacks on a community college and the 91 Freeway.

2012: Marquez begins to distance himself from Farook and the terrorism plot.

2014: Marquez marries a woman whose sister is married to Farook’s brother.

2015: After Farook carries out the massacre, Marquez admits that he bought two guns that were used in shooting.

Source: U.S. attorney’s office.