I always translate ている as "have verb (past participle)" when refering to
resultant state.

But that current meaning can also be brought upon by past tense of verb
combined together with こと and ある.

> 彼を殺している(or ある)
>
> 彼を殺したことはある

ている here is ofcourse not the progressive one, as some verbs (die, kill, open)
do not have it.
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2017-03-19T05:01:59.087
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2017-03-19T05:40:23.623
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question
grammar
Difference between "verb(past) + こと + ある" and "verb + ている"
They represent different times and states of being. I gave an example that
doesn't involve killing :)

```

    ている   - Ongoing action 
    てある　 - Exists in a set state.
    したことはある  - States an experience.
    
    紙にかいてる　- I am writing it on a piece of paper
    紙に書いてある 　- It is written on [that] peice of paper
    紙に書いたことある   - I have written on a piece of paper
    
```
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2017-03-19T05:05:10.707
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answer
This answer might be completely wrong but I'm writing it anyway in the hope of
learning from it.

> 彼を殺している

is simply

> I have killed him.

Whereas

> 彼を殺したことはある

sounds to me like

> I have the experience of killing him

which sounds weird, because it sounds like he can be killed multiple times.

Perhaps we could translate 彼 as boyfriend and then it would make sense as

> I have experience of killing boyfriends.
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answer