Baraka's Heel Drop can be held to perform Heel Smite according to official Mortal Kombat 1 patch notes.

Baraka moves, skills and special abilities
Playable Mortal Kombat 1 fighter.
Basic Attacks
2Directional or character-specific normal attack.
Special Moves
7Baraka's airborne Death Spin special, referenced in official Mortal Kombat 1 parry and auto-facing notes.
A newer Baraka move added in an official Mortal Kombat 1 update.
Requirements / unlock: Available at 30% health or less.
Command details & verification
Character special move.
Character special move.
A Baraka multi-hit attack whose third hit received increased hit advantage in an official update.
Character special move.
Character special move.
Equippable Moves
1Equippable move.
Kombos
8Ground kombo string.
Ground kombo string.
Ground kombo string.
Ground kombo string.
Ground kombo string.
Ground kombo string.
Ground kombo string.
Ground kombo string.
Aerial Kombos
3Aerial kombo string.
Aerial kombo string.
Aerial kombo string.
Fatal Blow
1Fatal Blow.
Fatalities
2Fatality. Perform at close range.
Fatality. Perform at close range.
Brutalities
7Press Down, Down, Down during the hit. Final hit must come from Quick Taste.
Rapidly press any basic attack button during the hit. Final hit must come from Chop Chop.
Press Up, Up, Up during the hit. Final hit must come from Stab Stab. Opponent must be airborne.
Hold Back during the hit. Final hit must come from Euthanizer.
Hold Down during the hit. Final hit must come from Heel Drop.
Hold Back during the hit. Final hit must come from Bleeding Blade. Must be at jump distance.
Hold Forward during the hit. Final hit must come from Warrior's Fury.
Animality
1Animality. Perform at mid distance.