Police 3D-printed a murder victim's finger to unlock his phone

[Bouncer]

Police 3D-printed a murder victim's finger to unlock his phone | The Verge

[dna9488]

That is awesome. Love how technology has advanced. Now we can find out if OJ is innocent or not

[BEAST]

Finger print won't unlock the iphone if the phone is out of juice and recharged or if someone turns it off via the power button.
Anytime phone gets rebooted it requires the four and now six digit passcode. Once you enter that then you can use the fingerprint.
So in this case phone was just in sleep mode not off completely.