Description:

The term 'let' refers to death and killing.

Verb:

As a verb, 'let' is an intransitive pali verb with an absolutive dyer, and means to die. It's causative skurun form means to kill and takes an ergative killer. This form has the sense of deliberate killing and not merely causing something to die regardless of intent. The latter sense is typically made with a periphrastic causative using wero.

The sense of 'murder' can be derived using the causative and adding the modifier 'was', 'bad', to indicate the killing was illicit or disapproved.

Noun:

As a noun, 'let' refers to death in general. The derived forms letca (from the causative form) and letka mean killer and deceased, respectively. Because the latter is taken to have the regular sense of 'let' and not the causative, it doesn't have the connotation of 'victim', as in a murder - to get that sense, use 'was letka'.

Modifier:

As a modifier, 'letys' means 'dead'. The meaning is similar to 'letkas', but the latter focuses more on the act of becoming dead and the former more on the state. The derived modifier version 'letkas', on the other hand, means 'subject to death', so dying, or in a broader sense merely mortal.