Yes, he absolutely can – and in fact, he should.

In Jain dharma, there are two important points here:

1. Himsa done unknowingly (ajānāne / ajānata)

- If a mithyādṛṣṭi (wrong-believing) jīva kills or harms any jīva unknowingly, karmic bondage still happens, but it is less intense than if done knowingly with bad intention. - So, “I didn’t know” does not make it zero karma, but it does reduce the severity.

1. Feeling of repentance and going for prāyaścitta

- Even a mithyādṛṣṭi person can feel regret: - “I have done wrong.” - “I should not have done this.” - “I want to say sorry and improve.” - These feelings of ālochana (confession), pratikraman (repentance), and prāyaścitta (atonement) are always good, whether the person is samyag-dṛṣṭi or mithyādṛṣṭi. - Going to a sādhu and taking prāyaścitta with vinay (humility) is very much encouraged in Jainism, for all – even for a mithyādṛṣṭi.

What is important is:

• He should:

- Accept that himsā (violence) happened, - Honestly confess it (ālochana), - Regret it from the heart (pratikraman), - Take proper prāyaścitta as guided by the sādhu (like extra samayik, fasting, jāp, more carefulness in future), - Take nishchay (firm resolve) not to repeat it.

Even if he is mithyādṛṣṭi today, these good feelings and actions soften his karma, prepare the ground for samyag-darshan in future, and reduce the intensity of the sin.

So, answer in simple words:

• Yes, a mithyādṛṣṭi jīva who unknowingly kills a jīva can and should go to a sādhu and take prāyaścitta.
• This is a right step on the path of purification, not wrong at all.