don t you want to be my best friend i watched the video and i mean, like they could watch them sleeping, could have watched them changing. they could have seen all kinds of things. reporter: hacked by a cyber spy, the chilling voice watching the bedroom belonging to three little girls taunted alyssa before her father unplugged the device tonight ring saying their security was not breached, adding hackers often reuse credentials stolen or leaked from one service on other services experts say use strong passwords, change them often and enable two-factor authentication to make sure what is private stays that way lester. miguel, thank you. up next, the richest pitching contract ever wait until you hear what he ll make each announcer: nbc nightly news is brought to you by pacific life, a reliable income that lets you retire without retiring from life. that s the power of pacific.at